feat: enhance theme and permit listing with filtering and risk counts

- Filter out "不涉及" (not applicable) theme from list_all_themes()
- Add risk_count column to list_unbound_permits() with aggregated risk counts
- Improve unbound permits API to display risk count per permit-region combination

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

lawrisk/services/licensing_repo.py

@@ -2648,6 +2648,10 @@ def list_all_themes(
     for row in rows:
         record = {columns[idx]: row[idx] for idx in range(len(columns))}
         items.append(_serialize_theme_row(record))
+
+    # 过滤掉"不涉及"主题
+    items = [item for item in items if item.get("name") != "不涉及"]
+
     return items
 
 
@@ -2706,13 +2710,23 @@ def list_unbound_permits(
             p.name AS permit_name,
             rpd.unit_name,
             rpd.updated_at,
-            COALESCE(rpd.is_v2_visible, true) AS is_v2_visible
+            COALESCE(rpd.is_v2_visible, true) AS is_v2_visible,
+            COALESCE(risk_counts.risk_count, 0) AS risk_count
         FROM region_permit_details rpd
         JOIN regions r ON r.id = rpd.region_id
         JOIN permits p ON p.id = rpd.permit_id
         LEFT JOIN region_theme_permits rtp
             ON rtp.region_id = rpd.region_id
             AND rtp.permit_id = rpd.permit_id
+        LEFT JOIN (
+            SELECT
+                permit_id,
+                region_id,
+                COUNT(risk_id) AS risk_count
+            FROM region_permit_risks
+            GROUP BY permit_id, region_id
+        ) risk_counts ON risk_counts.permit_id = rpd.permit_id
+                      AND risk_counts.region_id = rpd.region_id
         {ps_join}
         WHERE {where_clause}
         ORDER BY r.name, p.name