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/collector.py

@@ -749,7 +749,7 @@ class SustainabilityCollector:
             try:
                 with open(main_cases_file, 'r', encoding='utf-8') as f:
                     existing_cases = json.load(f)
-            except:
+            except Exception:
                 existing_cases = []
         all_cases = existing_cases + [asdict(case) for case in self.new_cases]
         # 去重
@@ -949,7 +949,7 @@ def main():
 
     except Exception as e:
         try: logger.error(f"收集任务失败: {e}")
-        except: pass
+        except Exception: pass
         print(f"ERROR: {e}")
         sys.exit(1)