feat(sync): add SSE live feed, unified logs page, fix Oracle connection

- Add SSE event bus in sync_service (subscribe/unsubscribe/_emit)
- Add GET /api/sync/stream SSE endpoint for real-time sync progress
- Rewrite logs.html: unified runs table + live feed + summary + filters
- Rewrite logs.js: SSE EventSource client, run selection, pagination
- Dashboard: clickable runs navigate to /logs?run=, sync started banner
- Remove "Import Comenzi" nav item, delete sync_detail.html
- Add error_message column to sync_runs table with migration
- Fix: export TNS_ADMIN as OS env var so oracledb finds tnsnames.ora
- Fix: use get_oracle_connection() instead of direct pool.acquire()
- Fix: CRM_POLITICI_PRET_ART INSERT to match actual table schema

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

api/app/services/import_service.py

@@ -91,6 +91,8 @@ def import_single_order(order, id_pol: int = None, id_sectie: int = None) -> dic
         order_number = clean_web_text(order.number)
         order_date = convert_web_date(order.date)
 
+        if database.pool is None:
+            raise RuntimeError("Oracle pool not initialized")
         with database.pool.acquire() as conn:
             with conn.cursor() as cur:
                 # Step 1: Process partner