feat(telegram): bot bonuri fiscale — OCR → preview → Oracle write

- US-001: mută queue_client.py în data_entry/services/ocr/
- US-002/003/004: oracle_receipt_writer + oracle_server_id în DB
- US-005: receipt_handlers.py (PDF/photo/callback flow)
- US-006: wire handlers în main.py, per-schema connect, seq_cod.nextval
- US-007: .gitignore secrets/*.oracle_pass
- US-008/009/010: teste unit + integration + E2E
- setup-secrets.sh helper + template
- docs/telegram/README.md actualizat cu arhitectura nouă

Testat E2E pe DB live (MARIUSM_AUTO). COD din seq_cod.nextval.
pypdfium2 fallback pentru PDF decode (fără poppler).

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

backend/modules/telegram/db/operations.py

@@ -100,7 +100,8 @@ async def link_user_to_oracle(
     oracle_username: str,
     jwt_token: str,
     jwt_refresh_token: str,
-    token_expires_at: datetime
+    token_expires_at: datetime,
+    server_id: Optional[str] = None
 ) -> bool:
     """
     Link a Telegram user to an Oracle account and save JWT tokens.
@@ -111,6 +112,7 @@ async def link_user_to_oracle(
         jwt_token: JWT access token
         jwt_refresh_token: JWT refresh token
         token_expires_at: Token expiration timestamp
+        server_id: Oracle server ID for multi-server mode
 
     Returns:
         bool: True if successful
@@ -122,6 +124,7 @@ async def link_user_to_oracle(
             await db.execute("""
                 UPDATE telegram_users
                 SET oracle_username = ?,
+                    oracle_server_id = ?,
                     jwt_token = ?,
                     jwt_refresh_token = ?,
                     token_expires_at = ?,
@@ -130,6 +133,7 @@ async def link_user_to_oracle(
                 WHERE telegram_user_id = ?
             """, (
                 oracle_username,
+                server_id,
                 jwt_token,
                 jwt_refresh_token,
                 token_expires_at,
@@ -138,7 +142,7 @@ async def link_user_to_oracle(
             ))
 
             await db.commit()
-            logger.info(f"User {telegram_user_id} linked to Oracle user {oracle_username}")
+            logger.info(f"User {telegram_user_id} linked to Oracle user {oracle_username} (server_id={server_id})")
             return True
 
     except Exception as e: