Refactor downloader and file manager for improved rclone integration and add healthcheck and smoke test options

- Renamed download flags in ContentDownloader for clarity.
- Enhanced FileManager with methods to build upload paths and verify existing files for rclone uploads.
- Updated StreamProcessor to return success status for stream processing.
- Added rclone smoke test and healthcheck functions to validate configuration and tool availability.
- Improved environment variable handling with a utility function.
- Updated TwitchArchive to incorporate new rclone verification and processing logic.
- Added unit tests for new functionality and refactored existing tests for clarity and coverage.

Co-authored-by: Copilot <copilot@github.com>

modules/stream_monitor.py

@@ -9,6 +9,7 @@ import requests
 from colorama import Fore, Style
 
 from .constants import TWITCH_OAUTH_URL, TWITCH_API_URL, TWITCH_GQL_URL, TWITCH_GQL_CLIENT_ID
+from .utils import get_env_value
 
 
 class StreamMonitor:
@@ -40,7 +41,9 @@ class StreamMonitor:
             return self._oauth_token
         
         try:
-            url = f"{TWITCH_OAUTH_URL}?client_id={os.getenv('CLIENT-ID')}&client_secret={os.getenv('CLIENT-SECRET')}&grant_type=client_credentials"
+            client_id = get_env_value('CLIENT-ID', 'CLIENT_ID')
+            client_secret = get_env_value('CLIENT-SECRET', 'CLIENT_SECRET')
+            url = f"{TWITCH_OAUTH_URL}?client_id={client_id}&client_secret={client_secret}&grant_type=client_credentials"
             response = requests.post(url, timeout=15)
             response.raise_for_status()
             self._oauth_token = response.json()['access_token']
@@ -69,7 +72,7 @@ class StreamMonitor:
             url = f'{TWITCH_API_URL}/users?login={self.username}'
             headers = {
                 "Authorization": f"Bearer {self.get_oauth_token()}",
-                "Client-ID": os.getenv('CLIENT-ID')
+                "Client-ID": get_env_value('CLIENT-ID', 'CLIENT_ID')
             }
             response = requests.get(url, headers=headers, timeout=15)
             response.raise_for_status()