fix: copy button HTTP fallback, reset-admin-password in Docker, scripts volume

- CellNetwork.jsx CopyButton: use execCommand fallback when clipboard API
  is unavailable (HTTP non-localhost context)
- Makefile reset-admin-password: run inside cell-api container via docker exec
  so bcrypt and all deps are available without host installation
- docker-compose.yml: mount ./scripts:/app/scripts:ro in cell-api so the
  reset script is accessible inside the container
- scripts/reset_admin_password.py: auto-detect API module path and data dir
  so the script works in both host (api/ sibling) and container (/app) layouts

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

scripts/reset_admin_password.py

@@ -11,11 +11,24 @@ import os
 import secrets
 import string
 
-sys.path.insert(0, os.path.join(os.path.dirname(__file__), '..', 'api'))
+_here = os.path.dirname(os.path.abspath(__file__))
+# Find auth_manager: host layout has api/ sibling, container has it one level up at /app
+for _api_path in [os.path.join(_here, '..', 'api'), os.path.join(_here, '..'), '/app']:
+    if os.path.isfile(os.path.join(_api_path, 'auth_manager.py')):
+        sys.path.insert(0, os.path.normpath(_api_path))
+        break
 
-ROOT = os.path.join(os.path.dirname(__file__), '..')
-INIT_PW_FILE = os.path.normpath(os.path.join(ROOT, 'data', 'api', '.admin_initial_password'))
-TEST_PW_FILE  = os.path.normpath(os.path.join(ROOT, 'data', 'api', '.test_admin_pass'))
+ROOT = os.path.normpath(os.path.join(_here, '..'))
+# data dir: host uses ROOT/data/api, container mounts data/api at ROOT/data
+for _data in [os.path.join(ROOT, 'data', 'api'), os.path.join(ROOT, 'data'), '/app/data']:
+    if os.path.isdir(_data):
+        _DATA_DIR = _data
+        break
+else:
+    _DATA_DIR = os.path.join(ROOT, 'data', 'api')
+
+INIT_PW_FILE = os.path.join(_DATA_DIR, '.admin_initial_password')
+TEST_PW_FILE  = os.path.join(_DATA_DIR, '.test_admin_pass')
 
 
 def _generate_password(length: int = 20) -> str:
@@ -32,7 +45,7 @@ def _generate_password(length: int = 20) -> str:
 
 def _set_password(new_password: str) -> None:
     from auth_manager import AuthManager
-    data_dir = os.path.normpath(os.path.join(ROOT, 'data', 'api'))
+    data_dir = _DATA_DIR
     os.makedirs(data_dir, exist_ok=True)
     mgr = AuthManager(data_dir=data_dir, config_dir='/tmp')
     if mgr.set_password_admin('admin', new_password):