diff --git a/app/adapters/system/update.py b/app/adapters/system/update.py
index 300866e9f..e664ee515 100644
--- a/app/adapters/system/update.py
+++ b/app/adapters/system/update.py
@@ -853,6 +853,28 @@ class SystemUpdateManager(metaclass=SingletonClass):
                 follow_symlinks=False,
             )
 
+    def _copy_plugin_runtime_payload(self, source: Path, destination: Path) -> None:
+        """
+        迁移插件运行时内容，但保留新版宿主的包根入口。
+
+        ``app/plugins/__init__.py`` 属于后端源码提供的兼容入口，不属于持久化插件；
+        旧版本该文件包含宿主实现，随插件目录迁移会遮蔽新版 SDK 的兼容符号。
+        """
+        destination.mkdir(parents=True, exist_ok=True)
+        for destination_path in destination.iterdir():
+            if destination_path.name != "__init__.py":
+                self._remove_path(destination_path)
+
+        for source_path in source.iterdir():
+            if source_path.name == "__init__.py":
+                continue
+            destination_path = destination / source_path.name
+            if source_path.is_dir() and not source_path.is_symlink():
+                shutil.copytree(source_path, destination_path, symlinks=True)
+            else:
+                shutil.copy2(source_path, destination_path, follow_symlinks=False)
+            self._preserve_tree_ownership(source_path, destination_path)
+
     @staticmethod
     def _clear_staged_native_resources(resource_dir: Path) -> None:
         """清除暂存目录中的旧平台原生站点资源。"""
@@ -921,8 +943,8 @@ class SystemUpdateManager(metaclass=SingletonClass):
         """
         解压并组装待切换的 Docker 后端、前端和插件资源载荷。
 
-        新版本归档是 Python 源码的唯一来源，旧版本目录只叠加插件和站点运行时资源，
-        避免把新版新增的应用模块覆盖掉。
+        新版本归档是 Python 源码的唯一来源，旧版本目录只迁移插件和站点运行时内容，
+        不覆盖新版的插件包根兼容入口或新增应用模块。
         """
         backend_extract = temporary_root / "backend"
         frontend_extract = temporary_root / "frontend"
@@ -942,13 +964,13 @@ class SystemUpdateManager(metaclass=SingletonClass):
         current_app = self._docker_app_dir
         current_plugins = current_app / "app" / "plugins"
         stage_plugins = stage_app / "app" / "plugins"
-        if stage_plugins.exists() or stage_plugins.is_symlink():
+        if stage_plugins.is_symlink():
             self._remove_path(stage_plugins)
+        if stage_plugins.exists() and not stage_plugins.is_dir():
+            raise RuntimeError("插件运行目录不是目录")
+        stage_plugins.mkdir(parents=True, exist_ok=True)
         if current_plugins.is_dir():
-            shutil.copytree(current_plugins, stage_plugins, symlinks=True)
-            self._preserve_tree_ownership(current_plugins, stage_plugins)
-        else:
-            stage_plugins.mkdir(parents=True, exist_ok=True)
+            self._copy_plugin_runtime_payload(current_plugins, stage_plugins)
         if not (stage_plugins / "__init__.py").is_file():
             raise RuntimeError("插件运行目录缺少 app.plugins 兼容入口")
 
diff --git a/docker/update.sh b/docker/update.sh
index 7c877dc4e..5e7bf227f 100644
--- a/docker/update.sh
+++ b/docker/update.sh
@@ -323,19 +323,22 @@ function stage_runtime_payload() {
     [ -f "${stage_app}/uv.lock" ] || return 1
     [ -f "${TMP_PATH}/dist/index.html" ] || return 1
 
+    if [ -e "${stage_plugin_dir}" ] && [ ! -d "${stage_plugin_dir}" ]; then
+        ERROR "插件运行目录不是目录"
+        return 1
+    fi
+    mkdir -p "${stage_plugin_dir}" || return 1
+    # 新版后端归档提供宿主兼容入口；仅迁移旧目录中的插件内容，避免旧版入口覆盖它。
+    if ! find "${stage_plugin_dir}" -mindepth 1 -maxdepth 1 \
+        ! -name "__init__.py" -exec rm -rf -- {} \;; then
+        return 1
+    fi
     if [ -d "${APP_DIR}/app/plugins" ]; then
-        rm -rf "${stage_plugin_dir}" || return 1
-        mkdir -p "${stage_plugin_dir}" || return 1
-        if ! cp -a "${APP_DIR}/app/plugins/." "${stage_plugin_dir}/"; then
+        if ! find "${APP_DIR}/app/plugins" -mindepth 1 -maxdepth 1 \
+            ! -name "__init__.py" -exec cp -a {} "${stage_plugin_dir}/" \;; then
             return 1
         fi
-    else
-        mkdir -p "${stage_plugin_dir}" || return 1
     fi
-    # 保留 app.plugins 兼容入口；V1/V2 插件仍从这里导入 _PluginBase。
-    # 删除后 app.plugins 会退化为 namespace package，旧插件会在启动时全部导入失败。
-    # 该文件必须是不含实现的包说明：契约基类归 app.sdk.plugin，包根自带旧版实现会
-    # 遮蔽兼容符号，此时 Compat 会直接拒绝导入并报出覆盖了哪个 canonical 路径。
     if [ ! -f "${stage_plugin_dir}/__init__.py" ]; then
         ERROR "插件运行目录缺少 app.plugins 兼容入口"
         return 1
diff --git a/scripts/perf/moviepilot_docker_ab.py b/scripts/perf/moviepilot_docker_ab.py
index 2d5270bf8..2b4a9bc90 100644
--- a/scripts/perf/moviepilot_docker_ab.py
+++ b/scripts/perf/moviepilot_docker_ab.py
@@ -106,8 +106,9 @@ FROM ${MP_SUBSTRATE} AS frozen
 
 RUN set -eux; \
     mkdir -p /frozen/plugins /frozen/site; \
-    cp -a /app/app/plugins/. /frozen/plugins/; \
-    test -f /frozen/plugins/__init__.py; \
+    find /app/app/plugins -mindepth 1 -maxdepth 1 ! -name '__init__.py' \
+      -exec cp -a '{}' /frozen/plugins/ \;; \
+    test -f /app/app/plugins/__init__.py; \
     rm -rf /frozen/plugins/__pycache__; \
     find /app/app/application/site -maxdepth 1 -type f \
       \( -name 'sites.*.so' -o -name 'user.sites.v3.bin' \) \
diff --git a/tests/test_docker_payload_contract.py b/tests/test_docker_payload_contract.py
index 6ded8a150..fb8c3f77a 100644
--- a/tests/test_docker_payload_contract.py
+++ b/tests/test_docker_payload_contract.py
@@ -1,10 +1,13 @@
 """Docker 构建输入和镜像载荷分层合同。"""
 
+import shlex
+import subprocess
 from pathlib import Path
 
 
 ROOT = Path(__file__).resolve().parents[1]
 DOCKERFILE = ROOT / "docker" / "Dockerfile"
+UPDATER = ROOT / "docker" / "update.sh"
 RELEASE_WORKFLOW = ROOT / ".github" / "workflows" / "build-v3.yml"
 BETA_WORKFLOW = ROOT / ".github" / "workflows" / "beta.yml"
 
@@ -82,13 +85,68 @@ def test_dockerfile_assigns_each_payload_to_an_independent_stage() -> None:
     assert "RUN rm -rf /app/frontend-dist" in dockerfile
 
 
-def test_plugin_runtime_updates_preserve_legacy_base_entrypoint() -> None:
-    """更新和性能覆盖镜像必须保留旧插件导入 _PluginBase 所需的兼容入口。"""
+def test_plugin_runtime_updates_preserve_host_entrypoint() -> None:
+    """更新载荷只迁移插件内容，不得覆盖新版宿主包根兼容入口。"""
     update_script = _read(ROOT / "docker" / "update.sh")
     perf_script = _read(ROOT / "scripts" / "perf" / "moviepilot_docker_ab.py")
 
-    assert 'rm -f "${stage_plugin_dir}/__init__.py"' not in update_script
-    assert "rm -f /frozen/plugins/__init__.py" not in perf_script
+    assert 'find "${APP_DIR}/app/plugins" -mindepth 1 -maxdepth 1' in update_script
+    assert '! -name "__init__.py"' in update_script
+    assert 'cp -a "${APP_DIR}/app/plugins/."' not in update_script
+    assert "find /app/app/plugins -mindepth 1 -maxdepth 1" in perf_script
+    assert "! -name '__init__.py'" in perf_script
+    assert "cp -a /app/app/plugins/." not in perf_script
+
+
+def test_update_script_keeps_new_host_entrypoint_during_runtime_migration(
+    tmp_path: Path,
+) -> None:
+    """Docker 更新脚本迁移旧插件时不得覆盖新归档中的宿主入口。"""
+    app_dir = tmp_path / "current"
+    temp_dir = tmp_path / "temp"
+    stage_app = temp_dir / "App"
+    venv_dir = tmp_path / "venv"
+    current_plugins = app_dir / "app" / "plugins"
+    stage_plugins = stage_app / "app" / "plugins"
+    current_plugins.mkdir(parents=True)
+    stage_plugins.mkdir(parents=True)
+    (current_plugins / "__init__.py").write_text("old host\n", encoding="utf-8")
+    (current_plugins / "demoplugin" / "dist").mkdir(parents=True)
+    (current_plugins / "demoplugin" / "__init__.py").write_text(
+        "plugin\n", encoding="utf-8"
+    )
+    (stage_plugins / "__init__.py").write_text("new host\n", encoding="utf-8")
+    (stage_plugins / "stale").write_text("stale\n", encoding="utf-8")
+    for name, content in (
+        ("version.py", "APP_VERSION = 'v3.1.0'\n"),
+        ("pyproject.toml", "[project]\n"),
+        ("uv.lock", "version = 1\n"),
+    ):
+        (stage_app / name).parent.mkdir(parents=True, exist_ok=True)
+        (stage_app / name).write_text(content, encoding="utf-8")
+    (temp_dir / "dist").mkdir(parents=True)
+    (temp_dir / "dist" / "index.html").write_text("ok\n", encoding="utf-8")
+    python_bin = venv_dir / "bin" / "python3"
+    python_bin.parent.mkdir(parents=True)
+    python_bin.write_text("#!/bin/sh\nprintf '%s\\n' cpython-314\n", encoding="utf-8")
+    python_bin.chmod(0o755)
+
+    script = f"""
+set -eu
+CONFIG_DIR={shlex.quote(str(tmp_path / 'config'))}
+VENV_PATH={shlex.quote(str(venv_dir))}
+GITHUB_PROXY=""
+source {shlex.quote(str(UPDATER))}
+APP_DIR={shlex.quote(str(app_dir))}
+TMP_PATH={shlex.quote(str(temp_dir))}
+download_staged_resource() {{ return 0; }}
+stage_runtime_payload
+test "$(cat {shlex.quote(str(stage_plugins / '__init__.py'))})" = "new host"
+test -f {shlex.quote(str(stage_plugins / 'demoplugin' / '__init__.py'))}
+test ! -e {shlex.quote(str(stage_plugins / 'stale'))}
+"""
+
+    subprocess.run(["bash", "-c", script], check=True)
 
 
 def test_release_workflows_pin_and_record_external_payload_identities() -> None:
diff --git a/tests/test_system_update_manager.py b/tests/test_system_update_manager.py
index 4711706bd..71a20ec48 100644
--- a/tests/test_system_update_manager.py
+++ b/tests/test_system_update_manager.py
@@ -490,6 +490,10 @@ def test_apply_prepared_application_replaces_docker_payload_and_preserves_plugin
         archive.writestr("MoviePilot-v3.1.0/pyproject.toml", "[project]\n")
         archive.writestr("MoviePilot-v3.1.0/uv.lock", "version = 1\n")
         archive.writestr("MoviePilot-v3.1.0/new.py", "new\n")
+        archive.writestr(
+            "MoviePilot-v3.1.0/app/plugins/__init__.py",
+            "new compatibility\n",
+        )
         archive.writestr(
             "MoviePilot-v3.1.0/app/application/site/__init__.py",
             "",
@@ -531,6 +535,9 @@ def test_apply_prepared_application_replaces_docker_payload_and_preserves_plugin
     assert sync_calls[0][1] == {}
     assert (app_dir / "new.py").read_text(encoding="utf-8") == "new\n"
     assert not (app_dir / "old.py").exists()
+    assert (app_dir / "app" / "plugins" / "__init__.py").read_text(
+        encoding="utf-8"
+    ) == "new compatibility\n"
     assert (app_dir / "app" / "plugins" / "local_plugin.py").exists()
     assert (resource_dir / "user.sites.v3.bin").read_text(encoding="utf-8") == "old-resource\n"
     assert (resource_dir / "auth.py").read_text(encoding="utf-8") == "new-auth\n"