docs(config): document source of provider client IDs

Add inline comments to `CLIENT_ID` and `CLIENT_SECRET` definitions in auth base files to reference the external configuration file where these values are used.

src/rotator_library/providers/gemini_auth_base.py

@@ -13,8 +13,8 @@ import httpx
 
 lib_logger = logging.getLogger('rotator_library')
 
-CLIENT_ID = "681255809395-oo8ft2oprdrnp9e3aqf6av3hmdib135j.apps.googleusercontent.com"
-CLIENT_SECRET = "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"
+CLIENT_ID = "681255809395-oo8ft2oprdrnp9e3aqf6av3hmdib135j.apps.googleusercontent.com" ##https://api.kilocode.ai/extension-config.json
+CLIENT_SECRET = "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" ##https://api.kilocode.ai/extension-config.json
 TOKEN_URI = "https://oauth2.googleapis.com/token"
 REFRESH_EXPIRY_BUFFER_SECONDS = 300
 

src/rotator_library/providers/qwen_auth_base.py

@@ -14,7 +14,7 @@ import httpx
 
 lib_logger = logging.getLogger('rotator_library')
 
-CLIENT_ID = "f0304373b74a44d2b584a3fb70ca9e56"
+CLIENT_ID = "f0304373b74a44d2b584a3fb70ca9e56" ##https://api.kilocode.ai/extension-config.json
 TOKEN_ENDPOINT = "https://chat.qwen.ai/api/v1/oauth2/token"
 REFRESH_EXPIRY_BUFFER_SECONDS = 300