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/database.py

@@ -19,6 +19,10 @@ def init_oracle():
     instantclient_path = settings.INSTANTCLIENTPATH
     dsn = settings.ORACLE_DSN
 
+    # Ensure TNS_ADMIN is set as OS env var so oracledb can find tnsnames.ora
+    if settings.TNS_ADMIN:
+        os.environ['TNS_ADMIN'] = settings.TNS_ADMIN
+
     if force_thin:
         logger.info(f"FORCE_THIN_MODE=true: thin mode for {dsn}")
     elif instantclient_path:
@@ -68,7 +72,8 @@ CREATE TABLE IF NOT EXISTS sync_runs (
     imported        INTEGER DEFAULT 0,
     skipped         INTEGER DEFAULT 0,
     errors          INTEGER DEFAULT 0,
-    json_files      INTEGER DEFAULT 0
+    json_files      INTEGER DEFAULT 0,
+    error_message   TEXT
 );
 
 CREATE TABLE IF NOT EXISTS import_orders (
@@ -129,6 +134,12 @@ def init_sqlite():
             if col not in cols:
                 conn.execute(f"ALTER TABLE missing_skus ADD COLUMN {col} {typedef}")
                 logger.info(f"Migrated missing_skus: added column {col}")
+        # Migrate sync_runs: add error_message column
+        cursor = conn.execute("PRAGMA table_info(sync_runs)")
+        sync_cols = {row[1] for row in cursor.fetchall()}
+        if "error_message" not in sync_cols:
+            conn.execute("ALTER TABLE sync_runs ADD COLUMN error_message TEXT")
+            logger.info("Migrated sync_runs: added column error_message")
         conn.commit()
     except Exception as e:
         logger.warning(f"Migration check failed: {e}")