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/routers/invoices.py

@@ -1,7 +1,7 @@
 """
 API Router pentru facturi
 """
-from fastapi import APIRouter, Depends, HTTPException, Query
+from fastapi import APIRouter, Depends, HTTPException, Query, Request
 from typing import List, Optional
 from datetime import date
 # import sys  # Removed - no longer needed
@@ -16,6 +16,7 @@ router = APIRouter()
 
 @router.get("/", response_model=InvoiceListResponse)
 async def get_invoices(
+    request: Request,
     company: str = Query(description="Codul firmei"),
     partner_type: str = Query("CLIENTI", description="CLIENTI sau FURNIZORI"),
     luna: Optional[int] = Query(None, ge=1, le=12, description="Luna contabilă (1-12)"),
@@ -41,6 +42,8 @@ async def get_invoices(
         if company not in current_user.companies:
             raise HTTPException(status_code=403, detail=f"Nu aveți acces la firma {company}")
 
+        server_id = getattr(request.state, 'server_id', None)
+
         filter_params = InvoiceFilter(
             company=company,
             partner_type=partner_type,
@@ -55,7 +58,7 @@ async def get_invoices(
             page_size=page_size
         )
 
-        result = await InvoiceService.get_invoices(filter_params, current_user.username)
+        result = await InvoiceService.get_invoices(filter_params, current_user.username, server_id=server_id)
         return result
 
     except ValueError as e:
@@ -65,6 +68,7 @@ async def get_invoices(
 
 @router.get("/summary", response_model=InvoiceSummary)
 async def get_invoices_summary(
+    request: Request,
     company: str = Query(description="Codul firmei"),
     partner_type: str = Query("CLIENTI", description="CLIENTI sau FURNIZORI"),
     current_user: CurrentUser = Depends(get_current_user)
@@ -75,7 +79,9 @@ async def get_invoices_summary(
         if company not in current_user.companies:
             raise HTTPException(status_code=403, detail=f"Nu aveți acces la firma {company}")
 
-        result = await InvoiceService.get_invoice_summary(company, partner_type, current_user.username)
+        server_id = getattr(request.state, 'server_id', None)
+
+        result = await InvoiceService.get_invoice_summary(company, partner_type, current_user.username, server_id=server_id)
         return result
 
     except Exception as e:
@@ -83,6 +89,7 @@ async def get_invoices_summary(
 
 @router.get("/{invoice_number}")
 async def get_invoice_details(
+    request: Request,
     invoice_number: str,
     company: str = Query(description="Codul firmei"),
     current_user: CurrentUser = Depends(get_current_user)
@@ -92,8 +99,10 @@ async def get_invoice_details(
         # Verifică dacă utilizatorul are acces la firma specificată
         if company not in current_user.companies:
             raise HTTPException(status_code=403, detail=f"Nu aveți acces la firma {company}")
-        
-        result = await InvoiceService.get_invoice_details(company, invoice_number, current_user.username)
+
+        server_id = getattr(request.state, 'server_id', None)
+
+        result = await InvoiceService.get_invoice_details(company, invoice_number, current_user.username, server_id=server_id)
         return result
         
     except ValueError as e:
@@ -103,6 +112,7 @@ async def get_invoice_details(
 
 @router.get("/export/{format}")
 async def export_invoices(
+    request: Request,
     format: str,
     company: str = Query(description="Codul firmei"),
     partner_type: str = Query("CLIENTI", description="CLIENTI sau FURNIZORI"),
@@ -119,6 +129,8 @@ async def export_invoices(
     # Verifică dacă utilizatorul are acces la firma specificată
     if company not in current_user.companies:
         raise HTTPException(status_code=403, detail=f"Nu aveți acces la firma {company}")
+
+    server_id = getattr(request.state, 'server_id', None)  # For future use
     
     # Verifică formatul
     if format not in ["excel", "pdf", "csv"]: