refactor: remove legacy frontend code and implement new Next.js structure

- Deleted the old Register page and utility functions.
- Removed Tailwind CSS configuration and Vite configuration files.
- Added a new script for starting a single container with FastAPI and Next.js.
- Updated README to reflect the current status of the Next.js frontend.
- Implemented new login and registration API routes with improved error handling.
- Refactored frontend API calls to use the new proxy structure.
- Enhanced error handling in API response processing.
- Updated components to align with the new API endpoints and structure.

scripts/start_single_container.py

@@ -0,0 +1,98 @@
+import os
+import signal
+import subprocess
+import sys
+import time
+
+
+ROOT_DIR = "/app"
+WEB_DIR = "/app/web"
+
+
+def terminate_process(process: subprocess.Popen | None, label: str) -> None:
+    if process is None or process.poll() is not None:
+        return
+
+    print(f"Stopping {label}...")
+    process.terminate()
+    try:
+        process.wait(timeout=10)
+    except subprocess.TimeoutExpired:
+        process.kill()
+        process.wait(timeout=5)
+
+
+def main() -> int:
+    shared_env = os.environ.copy()
+    shared_env.setdefault("API_BASE_URL", "http://127.0.0.1:8000")
+    shared_env.setdefault("NEXT_SERVER_URL", "http://127.0.0.1:3000")
+    shared_env.setdefault("NEXT_TELEMETRY_DISABLED", "1")
+
+    next_env = shared_env.copy()
+    next_env["NODE_ENV"] = "production"
+    next_env["HOSTNAME"] = "0.0.0.0"
+    next_env["PORT"] = "3000"
+
+    next_process = subprocess.Popen(
+        ["node", "server.js"],
+        cwd=WEB_DIR,
+        env=next_env,
+    )
+
+    api_process: subprocess.Popen | None = None
+
+    def shutdown(signum, _frame):
+        print(f"Received signal {signum}, shutting down...")
+        terminate_process(api_process, "FastAPI")
+        terminate_process(next_process, "Next.js")
+        raise SystemExit(0)
+
+    signal.signal(signal.SIGINT, shutdown)
+    signal.signal(signal.SIGTERM, shutdown)
+
+    try:
+        migrate_result = subprocess.run(
+            [sys.executable, "-m", "alembic", "upgrade", "head"],
+            cwd=ROOT_DIR,
+            env=shared_env,
+            check=False,
+        )
+        if migrate_result.returncode != 0:
+            terminate_process(next_process, "Next.js")
+            return migrate_result.returncode
+
+        api_process = subprocess.Popen(
+            [
+                sys.executable,
+                "-m",
+                "uvicorn",
+                "main:app",
+                "--host",
+                "0.0.0.0",
+                "--port",
+                "8000",
+            ],
+            cwd=ROOT_DIR,
+            env=shared_env,
+        )
+
+        while True:
+            next_returncode = next_process.poll()
+            api_returncode = api_process.poll()
+
+            if next_returncode is not None:
+                terminate_process(api_process, "FastAPI")
+                return next_returncode
+
+            if api_returncode is not None:
+                terminate_process(next_process, "Next.js")
+                return api_returncode
+
+            time.sleep(1)
+    finally:
+        terminate_process(api_process, "FastAPI")
+        terminate_process(next_process, "Next.js")
+
+
+if __name__ == "__main__":
+    raise SystemExit(main())