feat: Migrate to ultrathin monolith architecture

Consolidate 3 separate applications (reports-app, data-entry-app, telegram-bot) into a unified
architecture with single backend and frontend:

Backend Changes:
- Unified FastAPI backend at backend/ with modular structure
- Modules: reports, data_entry, telegram in backend/modules/
- Centralized config.py and main.py with all routers registered
- Single worker mode (--workers 1) for Telegram bot compatibility
- Shared Oracle connection pool and JWT authentication
- Unified requirements.txt and environment configuration

Frontend Changes:
- Single Vue.js SPA with module-based routing
- Unified frontend at src/ with modules in src/modules/{reports,data-entry}/
- Shared components and stores in src/shared/
- Error boundaries for module isolation
- Dual API proxy in Vite for module communication

Infrastructure:
- New unified startup scripts: start-prod.sh, start-test.sh, start-backend.sh
- Environment templates: .env.dev.example, .env.test.example, .env.prod.example
- Updated deployment scripts for Windows IIS
- Simplified SSH tunnel management

Documentation:
- Comprehensive CLAUDE.md with architecture overview
- Module-specific docs in docs/{data-entry,telegram}/
- Architecture decision records in docs/ARCHITECTURE-DECISIONS.md
- Deployment guides consolidated in deployment/windows/docs/

This migration reduces complexity, improves maintainability, and enables easier
deployment while maintaining all existing functionality.

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

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

backend/modules/reports/cache/__init__.py

@@ -0,0 +1,66 @@
+"""
+Cache module for ROA2WEB
+
+Provides hybrid two-tier caching (Memory L1 + SQLite L2)
+with performance tracking and event-based invalidation.
+
+Usage:
+    # Initialize cache at app startup
+    from app.cache import init_cache
+    from app.cache.config import CacheConfig
+
+    config = CacheConfig.from_env()
+    await init_cache(config)
+
+    # Use @cached decorator in services
+    from app.cache.decorators import cached
+
+    @cached(cache_type='dashboard_summary', key_params=['company', 'username'])
+    async def get_complete_summary(company: str, username: str):
+        # ... Oracle query logic ...
+
+    # Get cache manager for manual operations
+    from app.cache import get_cache
+
+    cache = get_cache()
+    await cache.invalidate(company_id=123)
+"""
+
+from .config import CacheConfig
+from .cache_manager import (
+    init_cache,
+    get_cache,
+    close_cache,
+    CacheManager
+)
+from .decorators import cached
+from .event_monitor import (
+    init_event_monitor,
+    get_event_monitor,
+    toggle_event_monitor,
+    preload_all_schema_mappings
+)
+from .benchmarks import run_baseline_benchmarks
+
+__all__ = [
+    # Configuration
+    'CacheConfig',
+
+    # Cache Manager
+    'init_cache',
+    'get_cache',
+    'close_cache',
+    'CacheManager',
+
+    # Decorators
+    'cached',
+
+    # Event Monitor
+    'init_event_monitor',
+    'get_event_monitor',
+    'toggle_event_monitor',
+    'preload_all_schema_mappings',
+
+    # Benchmarks
+    'run_baseline_benchmarks',
+]