Maintenance update (#7)

- Use modern tooling uv and bun
- Various changes to work with latest PyAV and PIL that have changed their API
- Improved image, video and document previews (uses AVIF, renders AVIF/HEIC/videos in HDR, faster processing)
- Fix a server hang in some cases where a folder was moved or renamed
- Log exceptions instead of only returning 500 response to client
- Log timing of preview generation functions
- Default to quality 50 in previews (previously 40)

cista/serve.py

@@ -1,5 +1,7 @@
 import os
 import re
+import signal
+import sys
 from pathlib import Path
 
 from sanic import Sanic
@@ -11,6 +13,14 @@ def run(*, dev=False):
     """Run Sanic main process that spawns worker processes to serve HTTP requests."""
     from .app import app
 
+    # Set up immediate exit on Ctrl+C for faster termination
+    def signal_handler(signum, frame):
+        print("\nReceived interrupt signal, exiting immediately...")
+        os._exit(0)
+    
+    signal.signal(signal.SIGINT, signal_handler)
+    signal.signal(signal.SIGTERM, signal_handler)
+
     url, opts = parse_listen(config.config.listen)
     # Silence Sanic's warning about running in production rather than debug
     os.environ["SANIC_IGNORE_PRODUCTION_WARNING"] = "1"