refactor: restructure into domain-based sub-packages

Reorganize 16 flat root files into 4 logical sub-packages:

## New Structure
```
src/qoder_autopilot/
├── cli.py, register.py, errors.py   ← root (orchestration + core)
├── auth/                             ← Authentication & Identity
│   ├── oauth.py (OAuth device flow)
│   ├── identity.py (Faker identity gen)
│   ├── credentials.py (Creds storage)
│   └── otp.py (OTP extraction)
├── infra/                            ← Infrastructure & Integration
│   ├── config.py (Settings)
│   ├── user_config.py (Config CRUD)
│   ├── ninerouter.py (9Router SQLite)
│   ├── temp_mail.py (Mail providers)
│   └── relay.py (Relay FastAPI server)
├── setup/                            ← Setup & Diagnostics
│   ├── first_run.py (Welcome wizard)
│   ├── deploy.py (Worker deployment)
│   └── doctor.py (Health check)
├── utils/                            ← Shared Utilities
│   └── logger.py (Logging + verbosity)
├── browser/                          ← (unchanged)
├── captcha/                          ← (unchanged)
└── worker_template/                  ← (unchanged)
```

## Changes
- 11 files moved to sub-packages
- All relative imports updated across 27 source + 7 test files
- Test mock.patch paths updated (relay monkeypatch)
- Pre-existing test lint issues fixed (unused imports, sort)
- No behavior changes, no public API changes
- No version bump (pure internal refactor)

Author: Daivageralda

src/qoder_autopilot/__init__.py

@@ -14,6 +14,7 @@
 
 __version__ = "0.6.0"
 
+from .auth.oauth import initiate_device_flow, poll_device_token
 from .captcha import CaptchaSolver
 from .cli import run_one
 from .errors import (
@@ -30,9 +31,8 @@
     RegistrationError,
     TempMailError,
 )
-from .oauth import initiate_device_flow, poll_device_token
+from .infra.temp_mail import TempMail
 from .register import register_and_verify
-from .temp_mail import TempMail
 
 __all__ = [
     # Core functions

src/qoder_autopilot/auth/__init__.py

@@ -16,8 +16,8 @@
 from pathlib import Path
 from typing import Any
 
-from . import config
-from .logger import log
+from ..infra import config
+from ..utils.logger import log
 
 
 def save_creds(data: dict[str, Any], path: Path | None = None) -> None:

src/qoder_autopilot/credentials.py src/qoder_autopilot/auth/credentials.pysrc/qoder_autopilot/credentials.py renamed to src/qoder_autopilot/auth/credentials.py

@@ -22,8 +22,8 @@
 
 import requests
 
-from . import config
-from .logger import log, log_err, log_ok
+from ..infra import config
+from ..utils.logger import log, log_err, log_ok
 
 
 def base64url_encode(data: bytes) -> str:

src/qoder_autopilot/identity.py src/qoder_autopilot/auth/identity.pysrc/qoder_autopilot/identity.py renamed to src/qoder_autopilot/auth/identity.py

@@ -9,7 +9,7 @@
 from collections.abc import AsyncIterator
 from contextlib import asynccontextmanager
 
-from ..logger import log
+from ..utils.logger import log
 
 
 @asynccontextmanager

src/qoder_autopilot/oauth.py src/qoder_autopilot/auth/oauth.pysrc/qoder_autopilot/oauth.py renamed to src/qoder_autopilot/auth/oauth.py

@@ -17,7 +17,7 @@
 import platform
 import subprocess
 
-from ..logger import log
+from ..utils.logger import log
 
 _screen_size_cache: tuple[int, int] | None = None
 

src/qoder_autopilot/otp.py src/qoder_autopilot/auth/otp.pysrc/qoder_autopilot/otp.py renamed to src/qoder_autopilot/auth/otp.py

@@ -18,8 +18,8 @@
 import re
 import time
 
-from .. import config
-from ..logger import log
+from ..infra import config
+from ..utils.logger import log
 
 
 async def gemini_detect_gap(page) -> float | None:

src/qoder_autopilot/browser/camoufox.py

@@ -8,8 +8,8 @@
 import asyncio
 import time
 
-from .. import config
-from ..logger import log, log_err, log_ok
+from ..infra import config
+from ..utils.logger import log, log_err, log_ok
 
 
 async def handle_captcha_manual(page) -> bool: