feat: improve 429 handling with Tor support and clean CI

- Retry with new Tor identity on 429
- Improve error logging
- Remove .build.yml and .drone.yml

.build.yml

@@ -1,12 +0,0 @@
-image: debian/buster
-packages:
-  - python3-pip
-  - virtualenv
-tasks:
-  - test: |
-      cd yt-local
-      virtualenv -p python3 venv
-      source venv/bin/activate
-      python --version
-      pip install -r requirements-dev.txt
-      pytest

.drone.yml

@@ -1,10 +0,0 @@
-kind: pipeline
-name: default
-
-steps:
-- name: test
-  image: python:3.7.3
-  commands:
-    - pip install --upgrade pip
-    - pip install -r requirements-dev.txt
-    - pytest

youtube/util.py

@@ -372,10 +372,16 @@ def fetch_url(url, headers=(), timeout=15, report_text=None, data=None,
                     if not use_tor or not settings.route_tor:
                         logger.warning(f'YouTube returned 429 but Tor is not enabled. Consider enabling Tor routing.')
                         raise FetchError('429', reason=response.reason, ip=ip)
+                    else:
+                        # Tor is enabled but we've exhausted retries
+                        logger.error(f'YouTube blocked request - Tor exit node overutilized after {max_retries} retries. Exit IP: {ip}')
+                        raise FetchError('429', reason=response.reason, ip=ip,
+                                        error_message='Tor exit node overutilized after multiple retries')
 
-                    logger.error(f'YouTube blocked request - Tor exit node overutilized. Exit IP: {ip}')
+                # For Tor: get new identity immediately on 429
+                if use_tor and settings.route_tor:
+                    logger.info(f'YouTube blocked request - Tor exit node overutilized. Exit IP: {ip}. Getting new identity...')
 
-                    # get new identity
                     error = tor_manager.new_identity(start_time)
                     if error:
                         raise FetchError(
@@ -384,7 +390,7 @@ def fetch_url(url, headers=(), timeout=15, report_text=None, data=None,
                     else:
                         continue  # retry with new identity
 
-                # Calculate delay with exponential backoff and jitter
+                # For non-Tor: exponential backoff
                 delay = (base_delay * (2 ** attempt)) + random.uniform(0, 1)
                 logger.info(f'Rate limited (429). Waiting {delay:.1f}s before retry {attempt + 1}/{max_retries}...')
                 time.sleep(delay)