feat: add meeting transcription app scaffolding

- Add Python backend structure with FastAPI for transcription/summarization
- Add React UI with audio recording, transcript, and summary views
- Configure Tauri to manage Python backend lifecycle
- Set up Windows cross-compilation with cargo-xwin
- Add Gitea CI workflow for lint, test, and multi-platform builds
- Configure ESLint, Prettier, and Vitest for code quality

Note: App scaffolding only - Python env and models not yet set up

scripts/start_backend.py

@@ -0,0 +1,24 @@
+"""Start the Chronara backend server."""
+
+import os
+import sys
+import subprocess
+from pathlib import Path
+
+# Add src directory to Python path
+src_path = Path(__file__).parent.parent / "src"
+sys.path.insert(0, str(src_path))
+
+# Set environment for bundled deployment
+os.environ["CHRONARA_BUNDLED"] = "1"
+
+# Start the FastAPI server
+subprocess.run([
+    sys.executable,
+    "-m",
+    "uvicorn",
+    "backend.main:app",
+    "--host", "127.0.0.1",
+    "--port", "8000",
+    "--reload" if os.environ.get("CHRONARA_DEV") else ""
+])