feat: add lightweight AlphaSift screening integration (#1443)

* feat: add lightweight AlphaSift screening integration

* fix(review-feedback-1443): 解决冲突后重新确认受影响文件和 CI 结果 and Restrict install spec before executing pip

* fix(review-feedback-1443): add a feature/auth gate before invoking installation side effects

* fix: repair AlphaSift enable flow

* fix(review-feedback-1443): Enable config before calling AlphaSift install

* fix(review-feedback-1443): re-fetch status in the error path to avoid this UI/backend state

* fix(review-feedback-1443): 补充对应回归测试

* fix(review-feedback-1443): 补充对应测试

* fix(review-feedback-1443): api/v1/endpoints/alphasift.py 的状态接口会返回 ALPHASIFT INSTALL SPEC，而项目默认

* fix(review-feedback-1443): 补一个前端用例覆盖

* fix(review-feedback-1443): 解决冲突后再合入

* fix(review-feedback-1443): 解决后再重新确认 diff 与 CI 结果

* fix(review-feedback-1443): 解决冲突并确认解决后的 diff 未引入新风险

* fix(review-feedback-1443): Read picks from AlphaSift ScreenResult and Use AlphaSift's actual

* fix(review-feedback-1443): 修正

* fix(review-feedback-1443): 解决冲突并重新确认 CI/Web gate 结果

* fix(review-feedback-1443): 解决冲突并重新确认 CI/Web gate，另外需要澄清本次 diff 中 LLM 配置相关改动是否属于本 PR 范围及其兼容性影响

* fix(review-feedback-1443): 解决冲突，并补齐受影响前端构建/测试验证后再合入

* fix(review-feedback-1443): 解决冲突，并补齐受影响前端 Web gate 或等价 CI 证据后再合入

* fix(review-feedback-1443): 解决冲突，并补齐受影响 Web gate 与兼容性验证说明后再合入

* fix(review-feedback-1443): mark this field sensitive and/or display only a masked/sanitized source

* fix(review-feedback-1443): 解决冲突，并补齐受影响前端验证与外部兼容性说明后再合入

* fix(review-feedback-1443): 解决冲突，并补齐冲突解决后的验证结果后再合入

* fix(review-feedback-1443): 解决冲突，并补齐受影响后端/Web 验证证据后再合入

* fix(review-feedback-1443): 解决冲突后基于最终 head 重新给出验证结论，否则无法确认最终合入内容与当前审查内容一致

* fix(review-feedback-1443): 解决冲突并补齐冲突后的验证结论

* fix(review-feedback-1443): Clear stale candidates when strategy changes

* fix(review-feedback-1443): preserve TestClient cookies across requests

* fix(review-feedback-1443): 解决冲突并基于冲突后的最终 head 重新确认受影响验证，当前不能直接合入

* fix(review-feedback-1443): 补回归测试

* fix(review-feedback-1443): 补后端回归测试

* fix(review-feedback-1443): 解决冲突，并在解决后重新给出基于最终 head 的验证结果

* fix(review-feedback-1443): 解决冲突并基于最终 diff 重新确认验证结果

* fix(review-feedback-1443): 解决冲突，并在冲突解决后的最终 head 上重新给出后端与 Web 相关验证结论

* fix(review-feedback-1443): 解决冲突，并在最终 head 上重新确认后端、Web 和文档改动仍一致

* fix(review-feedback-1443): 当前 PR 存在合并冲突，虽然 CI 摘要为 success，但冲突解决后的最终代码和验证结果尚未形成，当前不能直接合入

* fix(review-feedback-1443): 解决冲突并补齐验证

* fix(review-feedback-1443): 解决冲突

* fix(review-feedback-1443): 修正测试客户端生命周期问题，并补齐前端 lint/build 验证

* fix(review-feedback-1443): 解决冲突

* feat: refine AlphaSift adapter integration

* fix: restore settings help metadata for CI

* fix(review-feedback-1443): Do not run lifespan for non-context TestClient requests

* fix(review-feedback-1443): Pin AlphaSift install source to an immutable ref

* fix(review-feedback-1443): 补齐后再合入

* fix: harden alphasift review feedback

* fix(review-feedback-1443): api/v1/endpoints/alphasift.py：自动安装路径在 adapter 可导入但 get status 返回

* fix: package alphasift endpoint in desktop build

* fix: bundle alphasift in desktop builds

* fix(review-feedback-1443): docs/alphasift-integration.md 中 AlphaSift adapter contract /

* fix: honor empty alphasift install spec

* fix: bundle alphasift in docker image

scripts/build-backend.ps1

@@ -46,11 +46,26 @@ if ($LASTEXITCODE -ne 0) {
   throw "pip install -r requirements.txt failed with exit code $LASTEXITCODE."
 }
 
+Write-Host 'Bundling AlphaSift desktop dependency...'
+$alphaSiftInstallSpec = (& $pythonBin -c "from src.config import DEFAULT_ALPHASIFT_INSTALL_SPEC; print(DEFAULT_ALPHASIFT_INSTALL_SPEC)").Trim()
+if ([string]::IsNullOrWhiteSpace($alphaSiftInstallSpec)) {
+  throw 'DEFAULT_ALPHASIFT_INSTALL_SPEC is empty; cannot bundle AlphaSift for desktop.'
+}
+& $pythonBin -m pip install $alphaSiftInstallSpec
+if ($LASTEXITCODE -ne 0) {
+  throw "pip install AlphaSift failed with exit code $LASTEXITCODE."
+}
+
 Write-Host 'Checking python-multipart availability...'
 if (-not (Test-PythonCode -Python $pythonBin -Code "import multipart, multipart.multipart")) {
   throw 'python-multipart is not importable in the selected Python environment.'
 }
 
+Write-Host 'Checking AlphaSift adapter availability...'
+if (-not (Test-PythonCode -Python $pythonBin -Code "import alphasift.dsa_adapter")) {
+  throw 'alphasift.dsa_adapter is not importable after installing AlphaSift.'
+}
+
 if (Test-Path 'dist\backend') {
   Remove-Item -Recurse -Force 'dist\backend'
 }
@@ -81,6 +96,9 @@ $hiddenImports = @(
   'api.v1.endpoints.history',
   'api.v1.endpoints.stocks',
   'api.v1.endpoints.health',
+  'api.v1.endpoints.alphasift',
+  'alphasift',
+  'alphasift.dsa_adapter',
   'api.v1.schemas',
   'api.v1.schemas.analysis',
   'api.v1.schemas.history',
@@ -114,7 +132,8 @@ $pyInstallerArgs = @(
   '--add-data', 'static;static',
   '--add-data', 'strategies;strategies',
   '--collect-data', 'litellm',
-  '--collect-data', 'tiktoken'
+  '--collect-data', 'tiktoken',
+  '--collect-all', 'alphasift'
 )
 $pyInstallerArgs += $hiddenImportArgs
 $pyInstallerArgs += 'main.py'