Add Windows tzdata dependency

requirements.lock

@@ -186,6 +186,8 @@ typing-inspection==0.4.2
     # via
     #   fastapi
     #   pydantic
+tzdata==2026.2 ; sys_platform == 'win32'
+    # via -r requirements.txt
 urllib3==2.7.0
     # via
     #   requests

requirements.txt

@@ -12,3 +12,4 @@ fastapi>=0.115,<1
 uvicorn>=0.34,<1
 websockets>=15,<16
 redis>=5.0,<7
+tzdata>=2026.1,<2027; sys_platform == "win32"