docs: update project docs and clean up redundant files

- PROGRESS.md: update to 2026-05-29 with security hardening (T-005),
  4-frontend architecture, AI provider refactoring, discovery features,
  landing page/referral/quota, desktop layout, admin AI management
- AGENTS.md: add AI provider list (Alibaba/NVIDIA, removed Claude/DeepL/Local),
  DB-driven config, CSRF/rate-limit/CORS notes, admin_ai reload quirk
- .env.example: sync with actual config, replace deprecated providers
  with current Sensenova/OpencodeGo/NVIDIA/Spark/Alibaba
- docs/PROJECT_STATUS.md: archive (fully superseded by PROGRESS.md)
- Remove generated JS files (_bing_search.js, _batch_search.js)
- Remove empty directories (data/corpus, data/models)
- Remove backend/.coverage (test artifact)
- Fix services/.gitignore to cover _bing_search.js
- Include pending AI provider DB admin feature (admin_ai, AIProvider model,
  AIProviders.vue, migration) and T-008 test report

backend/tests/conftest.py

@@ -9,6 +9,77 @@ import os
 
 sys.path.insert(0, os.path.dirname(os.path.dirname(os.path.abspath(__file__))))
 
+# Mock aliyunsdkalimt before importing app.main
+import types
+
+aliyunsdkalimt = types.ModuleType('aliyunsdkalimt')
+aliyunsdkalimt.__path__ = ['/tmp/mock_aliyunsdkalimt']
+sys.modules['aliyunsdkalimt'] = aliyunsdkalimt
+
+aliyunsdkalimt_request = types.ModuleType('aliyunsdkalimt.request')
+aliyunsdkalimt_request.__path__ = ['/tmp/mock_aliyunsdkalimt/request']
+sys.modules['aliyunsdkalimt.request'] = aliyunsdkalimt_request
+
+aliyunsdkalimt_request_v20181012 = types.ModuleType('aliyunsdkalimt.request.v20181012')
+sys.modules['aliyunsdkalimt.request.v20181012'] = aliyunsdkalimt_request_v20181012
+
+class TranslateGeneralRequest:
+    def __init__(self):
+        self.source_text = None
+        self.source_language = None
+        self.target_language = None
+        self.scene = None
+    
+    def setSourceText(self, text):
+        self.source_text = text
+    
+    def setSourceLanguage(self, lang):
+        self.source_language = lang
+    
+    def setTargetLanguage(self, lang):
+        self.target_language = lang
+    
+    def setScene(self, scene):
+        self.scene = scene
+
+
+class TranslateECommerceRequest:
+    def __init__(self):
+        self.source_text = None
+        self.source_language = None
+        self.target_language = None
+        self.scene = None
+    
+    def setSourceText(self, text):
+        self.source_text = text
+    
+    def setSourceLanguage(self, lang):
+        self.source_language = lang
+    
+    def setTargetLanguage(self, lang):
+        self.target_language = lang
+    
+    def setScene(self, scene):
+        self.scene = scene
+
+aliyunsdkalimt_request_v20181012.TranslateGeneralRequest = TranslateGeneralRequest
+aliyunsdkalimt_request_v20181012.TranslateECommerceRequest = TranslateECommerceRequest
+
+# Mock AcsClient
+aliyunsdkcore = types.ModuleType('aliyunsdkcore')
+aliyunsdkcore_client = types.ModuleType('aliyunsdkcore.client')
+
+class AcsClient:
+    def __init__(self, *args, **kwargs):
+        pass
+    
+    def do_action(self, request):
+        return b'{"TranslateResult": "mock translation"}'
+
+aliyunsdkcore_client.AcsClient = AcsClient
+sys.modules['aliyunsdkcore'] = aliyunsdkcore
+sys.modules['aliyunsdkcore.client'] = aliyunsdkcore_client
+
 from app.main import app
 from app.database import Base, get_db
 from app.models.user import User
@@ -25,7 +96,7 @@ TestAsyncSessionLocal = sessionmaker(
 )
 
 
-@pytest.fixture(scope="session")
+@pytest.fixture(scope="module")
 def event_loop():
     loop = asyncio.get_event_loop_policy().new_event_loop()
     yield loop
@@ -78,4 +149,11 @@ async def test_user(db_session: AsyncSession) -> User:
 async def auth_headers(test_user: User) -> dict:
     from app.core.security import create_access_token
     token = create_access_token({"sub": str(test_user.id), "tier": test_user.tier})
-    return {"Authorization": f"Bearer {token}"}
+    return {"Authorization": f"Bearer {token}"}
+
+
+# Mark all async test functions with pytest.mark.asyncio
+def pytest_collection_modifyitems(items):
+    for item in items:
+        if hasattr(item, 'function') and asyncio.iscoroutinefunction(item.function):
+            item.add_marker(pytest.mark.asyncio)