chore: improve Docker/Podman compatibility and package installation

- Update Claude permissions to allow podman-compose commands
- Improve Dockerfile package installation with poetry-core
- Switch to explicit docker.io image references for Podman compatibility
- Add PYTHONPATH configuration to ensure proper module imports
- Change frontend port from 80 to 8080 for non-root compatibility
- Add initial chat server implementation (main.py)

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

.claude/settings.local.json

@@ -1,8 +1,7 @@
 {
   "permissions": {
     "allow": [
-      "Bash(*:*)",
-      "Bash(*)"
+      "Bash(podman-compose:*)"
     ],
     "deny": [],
     "ask": [],