fix: Script bug fixes (bare except, timezone, regex, test)

- collector.py, compliance_checker.py, trends.py: bare except -> specific
- db_helper.py: datetime.now() -> timezone.utc (8 occurrences)
- compliance_checker.py: regex \x08 -> \b word boundary + import json
- search_providers.py: minor fixes
- test_new_features.py: service reachability check retry

Ultraworked with [Sisyphus](https://github.com/code-yeongyu/oh-my-openagent)

Co-authored-by: Sisyphus <clio-agent@sisyphuslabs.ai>

scripts/db_helper.py

@@ -6,7 +6,7 @@
 import sys
 import os
 from pathlib import Path
-from datetime import datetime, date, timedelta
+from datetime import datetime, date, timedelta, timezone
 from typing import Optional, Dict, List
 
 # 加载 .env（在 scripts/ 目录下运行时需要）
@@ -84,17 +84,17 @@ def update_topic_status(topic_id: str, status: str, compliance_score: Optional[i
         if not topic:
             return False
         topic.status = status
-        topic.updated_at = datetime.now()
+        topic.updated_at = datetime.now(timezone.utc)
         if compliance_score is not None:
             topic.compliance_score = compliance_score
         if reviewed_at is not None:
             topic.reviewed_at = reviewed_at
         if status == 'review' and topic.generated_at is None:
-            topic.generated_at = datetime.now()
-            topic.reviewed_at = topic.reviewed_at or datetime.now()
+            topic.generated_at = datetime.now(timezone.utc)
+            topic.reviewed_at = topic.reviewed_at or datetime.now(timezone.utc)
         if status == 'ready':
             topic.ready_at = datetime.now().date()
-            topic.reviewed_at = topic.reviewed_at or datetime.now()
+            topic.reviewed_at = topic.reviewed_at or datetime.now(timezone.utc)
         if status == 'published':
             topic.published_at = datetime.now().date()
         db.commit()
@@ -198,14 +198,14 @@ def save_topics_to_db(topics_data: List[Dict]):
                 if t.get('ready_at'):
                     try:
                         existing.ready_at = datetime.strptime(t['ready_at'], '%Y-%m-%d').date()
-                    except:
+                    except Exception:
                         pass
                 if t.get('published_at'):
                     try:
                         existing.published_at = datetime.strptime(t['published_at'], '%Y-%m-%d').date()
-                    except:
+                    except Exception:
                         pass
-                existing.updated_at = datetime.now()
+                existing.updated_at = datetime.now(timezone.utc)
             else:
                 new_topic = Topic(
                     id=t['id'],
@@ -225,8 +225,8 @@ def save_topics_to_db(topics_data: List[Dict]):
                     published_at=datetime.strptime(t['published_at'], '%Y-%m-%d').date() if t.get('published_at') else None,
                     compliance_score=t.get('compliance_score', 100),
                     platform_urls=t.get('platform_urls', {}),
-                    created_at=datetime.now(),
-                    updated_at=datetime.now()
+                    created_at=datetime.now(timezone.utc),
+                    updated_at=datetime.now(timezone.utc)
                 )
                 db.add(new_topic)
         db.commit()
@@ -246,7 +246,6 @@ def save_article(topic_id: str, platform: str, html_content: str, *, title: str
         from app.models import Article
         article_id = f"{platform}_{topic_id}"
         existing = db.query(Article).filter(Article.id == article_id).first()
-        now = datetime.now()
         if existing:
             existing.html_content = html_content
             if title: