feat: migrate paqctl to self-hosted Gitea (git.samnet.dev)

All repository URLs updated from GitHub (SamNet-dev/paqctl) to
Gitea (git.samnet.dev/SamNet-dev/paqctl). Third-party references
(hanselime/paqet, Xray, microsocks) remain on GitHub.

gfk/client/mainclient.py

@@ -0,0 +1,84 @@
+import subprocess
+import os
+import time
+import sys
+import signal
+import platform
+
+IS_WINDOWS = platform.system() == 'Windows'
+
+scripts = ['quic_client.py', 'vio_client.py']
+
+
+def kill_existing_script(script_name):
+    """Kill any existing instance of the script (cross-platform)"""
+    if IS_WINDOWS:
+        # On Windows, use taskkill to find and kill python processes
+        try:
+            result = subprocess.run(
+                ['wmic', 'process', 'where',
+                 f"commandline like '%{script_name}%' and name like '%python%'",
+                 'get', 'processid'],
+                capture_output=True, text=True, stderr=subprocess.DEVNULL
+            )
+            for line in result.stdout.split('\n'):
+                line = line.strip()
+                if line.isdigit():
+                    subprocess.run(['taskkill', '/F', '/PID', line],
+                                 stderr=subprocess.DEVNULL, stdout=subprocess.DEVNULL)
+        except Exception:
+            pass
+    else:
+        subprocess.run(['pkill', '-f', script_name], stderr=subprocess.DEVNULL)
+
+
+def run_script(script_name):
+    """Start a script, killing any existing instance first"""
+    kill_existing_script(script_name)
+    time.sleep(0.5)
+
+    if IS_WINDOWS:
+        p = subprocess.Popen([sys.executable, script_name],
+                           creationflags=subprocess.CREATE_NEW_PROCESS_GROUP)
+    else:
+        p = subprocess.Popen([sys.executable, script_name])
+    return p
+
+
+processes = []
+
+
+def signal_handler(sig, frame):
+    print('\nShutting down GFK client...')
+    for p in processes:
+        try:
+            p.terminate()
+            p.wait(timeout=3)
+        except Exception:
+            try:
+                p.kill()
+            except Exception:
+                pass
+    sys.exit(0)
+
+
+if __name__ == "__main__":
+    signal.signal(signal.SIGINT, signal_handler)
+    if not IS_WINDOWS:
+        signal.signal(signal.SIGTERM, signal_handler)
+
+    print("Starting GFK client...")
+    p1 = run_script(scripts[0])
+    time.sleep(1)
+    p2 = run_script(scripts[1])
+    processes.extend([p1, p2])
+
+    print("GFK running. Press Ctrl+C to stop.\n")
+
+    try:
+        p1.wait()
+        p2.wait()
+        print("All subprocesses have completed.")
+    except KeyboardInterrupt:
+        signal_handler(None, None)
+