feat: 添加密码管理功能，包括 API、数据库支持和前端界面

openspec/changes/archive/2026-01-23-add-password-manager/tasks.md

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+## 1. Spec
+- [x] 1.1 Update OpenSpec deltas for api/password-manager
+- [x] 1.2 Update OpenAPI 3.1 contract (spec/openapi.yaml)
+
+## 2. Database
+- [x] 2.1 Add migrations for credential storage tables + indexes
+
+## 3. Server
+- [x] 3.1 Implement credential CRUD APIs
+- [x] 3.2 Enable plaintext credential access
+- [x] 3.3 Implement admin credential access APIs
+
+## 4. Extension
+- [x] 4.1 Add content script for detecting login forms
+- [x] 4.2 Add save-credential prompt + confirm flow
+- [x] 4.3 Add autofill selector UI on login fields
+
+## 5. Web
+- [x] 5.1 Add desktop-only password manager page
+- [x] 5.2 Add session-based plaintext toggle
+- [x] 5.3 Add admin view for all users
+
+## 6. Tests
+- [x] 6.1 API tests for CRUD + plaintext + admin access
+- [x] 6.2 DB migration verification
+
+## 7. Verification
+- [x] 7.1 Specs updated in openspec/specs
+- [x] 7.2 OpenAPI updated and validated
+- [x] 7.3 DB migration applied
+- [x] 7.4 Server tests executed