docs: Update specifications to reflect configuration management implementation

Updated all spec-kit documents to document the implemented configuration
management features (User Story 12):

Changes:
- spec.md: Added User Story 12 with implementation status and functional
  requirements (FR-039 through FR-045)
- plan.md: Added Phase 2 (Configuration Management) as completed, updated
  phase status and last updated date
- data-model.md: Added GCoreServer entity with schema, validation rules,
  CRUD status, and critical implementation details
- tasks.md: Added Phase 13 for User Story 12 with implementation summary,
  updated task counts and dependencies
- tasks-revised-mvp.md: Added configuration management completion notice

Implementation Highlights:
- G-Core Server CRUD (CREATE, READ, DELETE working; UPDATE has known bug)
- Action Mapping CRUD (all operations working)
- SetupClient integration for .set file operations
- Critical cascade deletion bug fix (delete in reverse order)
- Comprehensive test scripts and verification tools

Documentation: SERVER_CRUD_IMPLEMENTATION.md, CRITICAL_BUG_FIX_DELETE.md

🤖 Generated with Claude Code (https://claude.com/claude-code)

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

specs/001-surveillance-api/tasks-revised-mvp.md

@@ -407,5 +407,31 @@ GET    /metrics                        # Prometheus metrics
 ---
 
 **Generated**: 2025-12-08
-**Scope**: Cross-switching MVP with authentication, expandable to GeViSet configuration
+**Updated**: 2025-12-16 (Configuration Management implemented)
+**Scope**: Cross-switching MVP with authentication + GeViSet configuration management ✅
 **Architecture**: Python FastAPI + C# gRPC Bridge + GeViScope SDK
+
+---
+
+## UPDATE: Configuration Management (2025-12-16) ✅ COMPLETED
+
+**Status**: Phase 9 (GeViSet Configuration Management) has been implemented ahead of schedule
+
+**Implemented Features**:
+- ✅ G-Core Server CRUD operations (CREATE, READ, DELETE working; UPDATE has known bug)
+- ✅ Action Mapping CRUD operations (all CRUD operations working)
+- ✅ SetupClient integration for configuration file operations
+- ✅ Configuration tree parsing and navigation
+- ✅ Critical bug fixes (cascade deletion prevention)
+
+**API Endpoints Added**:
+- `GET/POST/PUT/DELETE /api/v1/configuration/servers` - G-Core server management
+- `GET/POST/PUT/DELETE /api/v1/configuration/action-mappings` - Action mapping management
+
+**Documentation**:
+- [SERVER_CRUD_IMPLEMENTATION.md](../../SERVER_CRUD_IMPLEMENTATION.md)
+- [CRITICAL_BUG_FIX_DELETE.md](../../CRITICAL_BUG_FIX_DELETE.md)
+
+See Phase 9 section below for original planned tasks.
+
+---