refactor: replace SessionDep with explicit Annotated[Session, Depends(get_session)] across all routers

- Replace SessionDep type alias with explicit Annotated[Session, Depends(get_session)]
- Add missing imports for Session, Annotated, and Depends types
- Update all endpoint function signatures to use explicit dependency annotation
- Remove redundant `= Depends()` default values from session parameters
- Update docstrings and comments to reference new annotation pattern
- Apply changes consistently across all router

docs/DOCS_WORKFLOW_COMPLETION_SUMMARY_MARCH_2026.md

@@ -13,7 +13,7 @@ Successfully executed the comprehensive **Documentation Updates Workflow** follo
 - ✅ **Confirmed** planning document alignment with implementation status
 
 ### **Step 2: Automated Status Updates ✅ COMPLETE**
-- ✅ **Updated** Phase 4 status from 🔄 NEXT to ✅ COMPLETE in planning document
+- ✅ **Updated** Phase 4 status from ✅ COMPLETE to ✅ COMPLETE in planning document
 - ✅ **Updated** all Phase 4 sub-components (4.1, 4.2, 4.3, 4.4) to COMPLETE status
 - ✅ **Ensured** consistent ✅ COMPLETE markers across all documentation files
 - ✅ **Maintained** proper formatting and status indicator consistency