feat: implement OAuth login functionality

- Update environment configuration and gitignore
- Replace sensitive example with actual config file
- Refactor LLM prompt structure by removing login/session modules
- Update main application entry point for OAuth integration

.sensitive.example.json

@@ -1,10 +0,0 @@
-{
-    "*.google.com": {
-        "x_username": "bot.imnya.ng@gmail.com",
-        "x_password": "some.google.password"
-    },
-    "github.com": {
-        "x_username": "imnyang-bot",
-        "x_password": "some.github.password"
-    }
-}