feat: multi-Oracle server support with runtime switching

Complete implementation of multi-server Oracle database support:

Backend:
- Multi-pool Oracle with lazy loading per server
- Email-to-server cache for automatic server discovery
- JWT tokens include server_id claim
- /auth/check-identity and /auth/check-email endpoints
- /auth/my-servers endpoint for listing user's accessible servers
- Server switch with password re-authentication

Frontend:
- New ServerSelector component for header dropdown
- Multi-step login flow (identity → server → password)
- Server switching from header with password modal
- Mobile drawer menu with server selection
- Dark mode support for all new components
- URL bookmark support with ?server= query param

Scripts:
- Unified start.sh replacing start-prod.sh/start-test.sh
- Unified ssh-tunnel.sh with multi-server support
- Updated status.sh for new architecture

Tests:
- E2E tests for multi-server and single-server login flows
- Backend unit tests for all new endpoints
- Oracle multi-pool integration tests

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

shared/routes/calendar.py

@@ -14,7 +14,7 @@ Usage:
 import logging
 from typing import Optional, Callable, List
 
-from fastapi import APIRouter, Depends, HTTPException, Query
+from fastapi import APIRouter, Depends, HTTPException, Query, Request
 
 from auth.dependencies import get_current_user
 from auth.models import CurrentUser
@@ -51,9 +51,14 @@ def create_calendar_router(
     )
 
     # Helper to get schema for company
-    async def _get_schema_for_company(company_id: int) -> Optional[str]:
-        """Get Oracle schema for company ID."""
-        async with oracle_pool.get_connection() as connection:
+    async def _get_schema_for_company(company_id: int, server_id: Optional[str] = None) -> Optional[str]:
+        """Get Oracle schema for company ID.
+
+        Args:
+            company_id: The company ID to get schema for
+            server_id: The Oracle server ID (for multi-server mode)
+        """
+        async with oracle_pool.get_connection(server_id) as connection:
             with connection.cursor() as cursor:
                 cursor.execute("""
                     SELECT SCHEMA FROM CONTAFIN_ORACLE.V_NOM_FIRME
@@ -63,22 +68,28 @@ def create_calendar_router(
                 return result[0] if result else None
 
     # Apply cache to schema lookup if decorator provided
+    # Include server_id in cache key for multi-server mode
     if cache_decorator:
         _get_schema_for_company = cache_decorator(
             cache_type='schema',
-            key_params=['company_id']
+            key_params=['company_id', 'server_id']
         )(_get_schema_for_company)
 
     # Helper to get periods - can be cached
-    async def _get_available_periods(company_id: int) -> CalendarPeriodsResponse:
-        """Get available accounting periods for a company."""
-        schema = await _get_schema_for_company(company_id)
+    async def _get_available_periods(company_id: int, server_id: Optional[str] = None) -> CalendarPeriodsResponse:
+        """Get available accounting periods for a company.
+
+        Args:
+            company_id: The company ID to get periods for
+            server_id: The Oracle server ID (for multi-server mode)
+        """
+        schema = await _get_schema_for_company(company_id, server_id)
         if not schema:
             logger.warning(f"Schema not found for company {company_id}")
             return CalendarPeriodsResponse(periods=[], current_period=None, total_count=0)
 
         try:
-            async with oracle_pool.get_connection() as connection:
+            async with oracle_pool.get_connection(server_id) as connection:
                 with connection.cursor() as cursor:
                     cursor.execute(f"""
                         SELECT ANUL, LUNA
@@ -112,14 +123,16 @@ def create_calendar_router(
             return CalendarPeriodsResponse(periods=[], current_period=None, total_count=0)
 
     # Apply cache decorator if provided
+    # Include server_id in cache key for multi-server mode
     if cache_decorator:
         _get_available_periods = cache_decorator(
             cache_type='calendar_periods',
-            key_params=['company_id']
+            key_params=['company_id', 'server_id']
         )(_get_available_periods)
 
     @router.get("/periods", response_model=CalendarPeriodsResponse)
     async def get_calendar_periods(
+        request: Request,
         company: int = Query(..., description="Company ID"),
         current_user: CurrentUser = Depends(get_current_user)
     ) -> CalendarPeriodsResponse:
@@ -131,6 +144,8 @@ def create_calendar_router(
         if str(company) not in current_user.companies:
             raise HTTPException(403, f"Nu aveți acces la firma {company}")
 
-        return await _get_available_periods(company)
+        # Get server_id from request state (injected by auth middleware from JWT)
+        server_id = getattr(request.state, 'server_id', None)
+        return await _get_available_periods(company, server_id)
 
     return router