fix: ensure phpMyAdmin signin bridge + auto plugin migrations + PMA tmp dir

- Add plogical/phpmyadmin_utils.ensure_phpmyadmin_signin_bridge: restore
  phpmyadminsignin.php and tmp/ if missing (fixes 404 on /phpmyadmin/phpmyadminsignin.php).
- Call from databases phpMyAdmin page, fetchDetailsPHPMYAdmin, install, and upgrade PMA paths.
- install/upgrade: use makedirs(..., exist_ok=True) for phpmyadmin/tmp instead of mkdir.
- pluginInstaller: run migrate when migrations/ contains modules OR enable_migrations;
  use CyberCP venv python; --noinput for migrate; log non-zero exits.

plogical/phpmyadmin_utils.py

@@ -0,0 +1,44 @@
+# -*- coding: utf-8 -*-
+"""
+Ensure phpMyAdmin single-sign-on bridge files exist under public/phpmyadmin/.
+Fixes 404 on /phpmyadmin/phpmyadminsignin.php when the file was lost after a partial install or manual change.
+"""
+from __future__ import annotations
+
+import os
+import shutil
+
+from plogical.CyberCPLogFileWriter import CyberCPLogFileWriter as logging
+
+PMA_DIR = '/usr/local/CyberCP/public/phpmyadmin'
+SIGNIN_SRC = '/usr/local/CyberCP/plogical/phpmyadminsignin.php'
+SIGNIN_NAME = 'phpmyadminsignin.php'
+
+
+def ensure_phpmyadmin_signin_bridge() -> bool:
+    """
+    Copy plogical/phpmyadminsignin.php into the public phpMyAdmin tree if missing,
+    ensure tmp/ exists, and fix ownership for lscpd.
+    Returns True if the sign-in file is present afterward.
+    """
+    dst = os.path.join(PMA_DIR, SIGNIN_NAME)
+    try:
+        if not os.path.isdir(PMA_DIR):
+            return False
+        if not os.path.isfile(SIGNIN_SRC):
+            logging.writeToFile('phpmyadmin_utils: source signin missing at ' + SIGNIN_SRC)
+            return os.path.isfile(dst)
+        need_copy = (not os.path.isfile(dst)) or os.path.getsize(dst) < 32
+        if need_copy:
+            shutil.copy2(SIGNIN_SRC, dst)
+        tmp_dir = os.path.join(PMA_DIR, 'tmp')
+        os.makedirs(tmp_dir, exist_ok=True)
+        try:
+            from plogical.processUtilities import ProcessUtilities
+            ProcessUtilities.executioner('chown -R lscpd:lscpd ' + PMA_DIR)
+        except Exception as ch_ex:
+            logging.writeToFile('phpmyadmin_utils: chown skipped or failed (non-fatal): ' + str(ch_ex))
+        return os.path.isfile(dst)
+    except Exception as ex:
+        logging.writeToFile('phpmyadmin_utils: ensure_phpmyadmin_signin_bridge failed: ' + str(ex))
+        return os.path.isfile(dst)