Add NixOS VM configuration and new media search endpoint

- Introduced a new NixOS VM configuration in `flake.nix` for testing purposes.
- Updated CI workflow to build the VM using the flake input for a more streamlined process.
- Added a new API endpoint `/search` in the collection API to search owned media by title, with optional filtering by media type.
- Refactored frontend components to utilize the new media search functionality, updating types and state management accordingly.
- Enhanced CSS for the map component to ensure proper rendering in various layouts.

.gitea/workflows/test.yml

@@ -16,12 +16,8 @@ jobs:
     
     - name: Build NixOS VM
       run: |
-        # Build the VM configuration using nixos-rebuild
-        # This creates a VM that can be run with QEMU
-        nixos-rebuild build-vm \
-          -I nixos-config=./nix/test-vm.nix \
-          -I nixpkgs=<nixpkgs> \
-          -o vm-result
+        # Build the VM purely via the flake input nixpkgs (no host channels / no <nixpkgs> path)
+        nix build .#nixosConfigurations.test-vm.config.system.build.vm -o vm-result
     
     - name: Start VM
       run: |