Add PyCharm Dev run config and dev runner script

- run_dev.py: starts proxy, admin and frontend together with colored
  output per process; handles SIGTERM from PyCharm Stop button
- .idea/runConfigurations/Dev.xml: PyCharm Python run config
- .gitignore: allow Dev.xml via layered negation pattern
- vite.config.js: open browser automatically on dev server start

.gitignore

@@ -14,7 +14,10 @@ __pycache__/
 *.sqlite3
 
 # IDE
-.idea/
+.idea/*
+!.idea/runConfigurations/
+.idea/runConfigurations/*
+!.idea/runConfigurations/Dev.xml
 .vscode/
 
 # Frontend build

.idea/runConfigurations/Dev.xml

@@ -0,0 +1,16 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<component name="ProjectRunConfigurationManager">
+  <configuration default="false" name="Dev" type="PythonConfigurationType" factoryName="Python">
+    <module name="llm_quota" />
+    <option name="INTERPRETER_OPTIONS" value="" />
+    <option name="PARENT_ENVS" value="true" />
+    <option name="SDK_HOME" value="" />
+    <option name="WORKING_DIRECTORY" value="$PROJECT_DIR$" />
+    <option name="IS_MODULE_SDK" value="false" />
+    <option name="ADD_CONTENT_ROOTS" value="true" />
+    <option name="ADD_SOURCE_ROOTS" value="true" />
+    <option name="SCRIPT_NAME" value="$PROJECT_DIR$/run_dev.py" />
+    <option name="PARAMETERS" value="" />
+    <method v="2" />
+  </configuration>
+</component>

run_dev.py

@@ -0,0 +1,86 @@
+#!/usr/bin/env python3
+"""Dev runner: startet Proxy, Admin-API und Frontend gemeinsam."""
+import os
+import sys
+import signal
+import subprocess
+import threading
+from pathlib import Path
+
+
+def load_env(path: Path):
+    if not path.exists():
+        return
+    for line in path.read_text(encoding='utf-8').splitlines():
+        line = line.strip()
+        if line and not line.startswith('#') and '=' in line:
+            key, _, val = line.partition('=')
+            os.environ.setdefault(key.strip(), val.strip().strip('"\''))
+
+
+def pipe_output(proc: subprocess.Popen, label: str, color: str):
+    reset = '\033[0m'
+    prefix = f'\033[{color}m[{label}]{reset} '
+    for raw in iter(proc.stdout.readline, b''):
+        sys.stdout.write(prefix + raw.decode(errors='replace'))
+        sys.stdout.flush()
+
+
+def main():
+    root = Path(__file__).parent
+    load_env(root / '.env')
+
+    if not os.environ.get('ADMIN_PASSWORD'):
+        print('Fehler: ADMIN_PASSWORD nicht gesetzt (siehe .env)')
+        sys.exit(1)
+
+    python  = root / '.venv' / 'bin' / 'python'
+    backend = root / 'backend'
+    frontend = root / 'frontend'
+
+    proxy_host = os.environ.get('PROXY_HOST', '0.0.0.0')
+    proxy_port = os.environ.get('PROXY_PORT', '8000')
+    admin_port = os.environ.get('ADMIN_PORT', '8001')
+
+    print('Initialisiere Datenbank...')
+    subprocess.run([str(python), 'init_db.py'], cwd=backend, check=True)
+
+    print(f'Starte Proxy      → http://{proxy_host}:{proxy_port}')
+    print(f'Starte Admin-API  → http://127.0.0.1:{admin_port}')
+    print('Starte Frontend   → http://localhost:5173')
+
+    env = {**os.environ, 'PYTHONUNBUFFERED': '1'}
+
+    procs = [
+        (subprocess.Popen(
+            [str(python), '-m', 'uvicorn', 'main:app', '--reload',
+             '--host', proxy_host, '--port', proxy_port],
+            cwd=backend, stdout=subprocess.PIPE, stderr=subprocess.STDOUT, env=env,
+        ), 'Proxy   ', '34'),  # blau
+        (subprocess.Popen(
+            [str(python), '-m', 'uvicorn', 'admin:app', '--reload',
+             '--host', '127.0.0.1', '--port', admin_port],
+            cwd=backend, stdout=subprocess.PIPE, stderr=subprocess.STDOUT, env=env,
+        ), 'Admin   ', '33'),  # gelb
+        (subprocess.Popen(
+            ['npm', 'run', 'dev'],
+            cwd=frontend, stdout=subprocess.PIPE, stderr=subprocess.STDOUT,
+        ), 'Frontend', '32'),  # grün
+    ]
+
+    for proc, label, color in procs:
+        threading.Thread(target=pipe_output, args=(proc, label, color), daemon=True).start()
+
+    def stop(*_):
+        for p, _, _ in procs:
+            p.terminate()
+
+    signal.signal(signal.SIGINT, stop)
+    signal.signal(signal.SIGTERM, stop)
+
+    for p, _, _ in procs:
+        p.wait()
+
+
+if __name__ == '__main__':
+    main()