feat: Implement license-aware UI for revenue optimization (Phase 3A)

Business Objective: Transform WHOOSH from license-unaware to comprehensive
license-integrated experience that drives upgrade conversions and maximizes
customer lifetime value through usage visibility.

Implementation Summary:

1. SECURE BACKEND PROXY INTEGRATION:
   - License API proxy endpoints (/api/license/status, /api/license/quotas)
   - Server-side license ID resolution (no frontend exposure)
   - Mock data support for development and testing
   - Intelligent upgrade suggestion algorithms

2. COMPREHENSIVE FRONTEND LICENSE INTEGRATION:
   - License API Client with caching and error handling
   - Global License Context for state management
   - License Status Header for always-visible tier information
   - Feature Gate Component for conditional rendering
   - License Dashboard with quotas, features, upgrade suggestions
   - Upgrade Prompt Components for revenue optimization

3. APPLICATION-WIDE INTEGRATION:
   - License Provider integrated into App context hierarchy
   - License status header in main navigation
   - License dashboard route at /license
   - Example feature gates in Analytics page
   - Version bump: → 1.2.0

Key Business Benefits:
✅ Revenue Optimization: Strategic feature gating drives conversions
✅ User Trust: Transparent license information builds confidence
✅ Proactive Upgrades: Usage-based suggestions with ROI estimates
✅ Self-Service: Clear upgrade paths reduce sales friction

Security-First Design:
🔒 All license operations server-side via proxy
🔒 No sensitive license data exposed to frontend
🔒 Feature enforcement at API level prevents bypass
🔒 Graceful degradation for license API failures

Technical Implementation:
- React 18+ with TypeScript and modern hooks
- Context API for license state management
- Tailwind CSS following existing patterns
- Backend proxy pattern for security compliance
- Comprehensive error handling and loading states

Files Created/Modified:
Backend:
- /backend/app/api/license.py - Complete license proxy API
- /backend/app/main.py - Router integration

Frontend:
- /frontend/src/services/licenseApi.ts - API client with caching
- /frontend/src/contexts/LicenseContext.tsx - Global license state
- /frontend/src/hooks/useLicenseFeatures.ts - Feature checking logic
- /frontend/src/components/license/* - Complete license UI components
- /frontend/src/App.tsx - Context integration and routing
- /frontend/package.json - Version bump to 1.2.0

This Phase 3A implementation provides the complete foundation for
license-aware user experiences, driving revenue optimization through
intelligent feature gating and upgrade suggestions while maintaining
excellent UX and security best practices.

Ready for KACHING integration and Phase 3B advanced features.

🤖 Generated with Claude Code (claude.ai/code)

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

backend/app/main.py

@@ -233,6 +233,10 @@ app = FastAPI(
         {
             "name": "project-setup",
             "description": "Comprehensive project setup with GITEA, Age encryption, and member management"
+        },
+        {
+            "name": "license",
+            "description": "License status, quotas, feature availability, and upgrade suggestions"
         }
     ],
     lifespan=lifespan
@@ -258,7 +262,7 @@ def get_coordinator() -> UnifiedCoordinator:
     return unified_coordinator
 
 # Import API routers
-from .api import agents, workflows, executions, monitoring, projects, tasks, cluster, distributed_workflows, cli_agents, auth, bzzz_logs, cluster_registration, members, templates, ai_models, bzzz_integration, ucxl_integration, cluster_setup, git_repositories
+from .api import agents, workflows, executions, monitoring, projects, tasks, cluster, distributed_workflows, cli_agents, auth, bzzz_logs, cluster_registration, members, templates, ai_models, bzzz_integration, ucxl_integration, cluster_setup, git_repositories, license
 
 # Import error handlers and response models
 from .core.error_handlers import (
@@ -302,6 +306,7 @@ app.include_router(bzzz_integration.router, tags=["bzzz-integration"])
 app.include_router(ucxl_integration.router, tags=["ucxl-integration"])
 app.include_router(cluster_setup.router, prefix="/api", tags=["cluster-setup"])
 app.include_router(git_repositories.router, prefix="/api", tags=["git-repositories"])
+app.include_router(license.router, prefix="/api", tags=["license"])
 
 # Override dependency functions in API modules with our coordinator instance
 agents.get_coordinator = get_coordinator