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>

backend/modules/reports/services/treasury_service.py

@@ -1,12 +1,12 @@
 # import sys  # Removed - no longer needed
 import os
+from typing import Optional, List, Tuple, Any
 
 import oracledb
 from shared.database.oracle_pool import oracle_pool
 from ..models.treasury import BankCashRegister, RegisterFilter, RegisterListResponse, AccountingPeriod
 from ..cache.decorators import cached
 from decimal import Decimal
-from typing import Optional, List, Tuple, Any
 import logging
 
 logger = logging.getLogger(__name__)
@@ -15,10 +15,10 @@ class TreasuryService:
     """Service pentru trezorerie - registru casă și bancă"""
 
     @staticmethod
-    @cached(cache_type='schema', key_params=['company_id'])
-    async def _get_schema(company_id: int) -> str:
+    @cached(cache_type='schema', key_params=['company_id', 'server_id'])
+    async def _get_schema(company_id: int, server_id: Optional[str] = None) -> str:
         """Obține schema pentru company_id (CACHED PERMANENT)"""
-        async with oracle_pool.get_connection() as connection:
+        async with oracle_pool.get_connection(server_id) as connection:
             with connection.cursor() as cursor:
                 schema_query = """
                     SELECT schema
@@ -99,8 +99,8 @@ class TreasuryService:
             return " UNION ALL ".join(queries)
 
     @staticmethod
-    @cached(cache_type='treasury', key_params=['filter_params', 'username'])
-    async def get_bank_cash_register(filter_params: RegisterFilter, username: str) -> RegisterListResponse:
+    @cached(cache_type='treasury', key_params=['filter_params', 'username', 'server_id'])
+    async def get_bank_cash_register(filter_params: RegisterFilter, username: str, server_id: Optional[str] = None) -> RegisterListResponse:
         """
         Obține registrul de casă și bancă din vbancasa views (CACHED 10 min)
 
@@ -114,9 +114,9 @@ class TreasuryService:
         Toate în aceeași tranzacție!
         """
         company_id = int(filter_params.company)
-        schema = await TreasuryService._get_schema(company_id)
+        schema = await TreasuryService._get_schema(company_id, server_id)
 
-        async with oracle_pool.get_connection() as connection:
+        async with oracle_pool.get_connection(server_id) as connection:
             with connection.cursor() as cursor:
 
                 # Construiește query-ul pentru tipul de registru selectat
@@ -350,14 +350,14 @@ class TreasuryService:
                 )
 
     @staticmethod
-    @cached(cache_type='treasury', key_params=['company_id', 'register_type'])
-    async def get_bank_cash_accounts(company_id: int, register_type: str) -> List[str]:
+    @cached(cache_type='treasury', key_params=['company_id', 'register_type', 'server_id'])
+    async def get_bank_cash_accounts(company_id: int, register_type: str, server_id: Optional[str] = None) -> List[str]:
         """
         Obține lista distinctă de conturi bancă/casă (bancasa) pentru dropdown.
         Cached pentru performanță.
         IMPORTANT: Trebuie să setăm contextul PACK_SESIUNE înainte de a accesa vbancasa views!
         """
-        schema = await TreasuryService._get_schema(company_id)
+        schema = await TreasuryService._get_schema(company_id, server_id)
 
         # Map register_type to view
         view_map = {
@@ -372,7 +372,7 @@ class TreasuryService:
 
         view_name = view_map[register_type]
 
-        async with oracle_pool.get_connection() as connection:
+        async with oracle_pool.get_connection(server_id) as connection:
             with connection.cursor() as cursor:
                 # PL/SQL block to set session context and get accounts
                 plsql_block = f"""