feat: Add admin navigation, fix modals, clickable stats, update docs

- Add admin dropdown menu in dashboard header with links to all admin pages
- Fix template modal: larger size (800px), responsive grid, type/priority dropdowns
- Fix recurring tickets modal: add Type and Assign To fields, larger size
- Make dashboard stat cards clickable for quick filtering
- Fix user-activity query (remove is_active requirement)
- Add table existence check in ticket_dependencies API
- Fix table overflow on dashboard
- Update Claude.md and README.md with current project status
- Remove migrations directory (all migrations completed)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

migrations/run_migrations.php

@@ -1,107 +0,0 @@
-<?php
-/**
- * Database Migration Runner
- * Executes all migration files in order
- */
-
-error_reporting(E_ALL);
-ini_set('display_errors', 1);
-
-// Load environment variables
-$envFile = dirname(__DIR__) . '/.env';
-if (!file_exists($envFile)) {
-    die("Error: .env file not found at $envFile\n");
-}
-
-$envVars = parse_ini_file($envFile);
-if (!$envVars) {
-    die("Error: Could not parse .env file\n");
-}
-
-// Connect to database
-$conn = new mysqli(
-    $envVars['DB_HOST'],
-    $envVars['DB_USER'],
-    $envVars['DB_PASS'],
-    $envVars['DB_NAME']
-);
-
-if ($conn->connect_error) {
-    die("Database connection failed: " . $conn->connect_error . "\n");
-}
-
-echo "Connected to database: {$envVars['DB_NAME']}\n\n";
-
-// Get all migration files
-$migrationFiles = glob(__DIR__ . '/*.sql');
-sort($migrationFiles);
-
-// Filter out rollback script
-$migrationFiles = array_filter($migrationFiles, function($file) {
-    return !strpos($file, 'rollback');
-});
-
-if (empty($migrationFiles)) {
-    echo "No migration files found.\n";
-    exit(0);
-}
-
-echo "Found " . count($migrationFiles) . " migration(s):\n";
-foreach ($migrationFiles as $file) {
-    echo "  - " . basename($file) . "\n";
-}
-echo "\n";
-
-// Execute each migration
-$successCount = 0;
-$errorCount = 0;
-
-foreach ($migrationFiles as $file) {
-    $filename = basename($file);
-    echo "Executing: $filename... ";
-
-    $sql = file_get_contents($file);
-
-    // Split SQL into individual statements
-    // This handles multi-statement migrations
-    if ($conn->multi_query($sql)) {
-        do {
-            // Store first result set
-            if ($result = $conn->store_result()) {
-                $result->free();
-            }
-            // Check for errors
-            if ($conn->errno) {
-                echo "FAILED\n";
-                echo "  Error: " . $conn->error . "\n";
-                $errorCount++;
-                break;
-            }
-        } while ($conn->more_results() && $conn->next_result());
-
-        // If we got through all results without error
-        if (!$conn->errno) {
-            echo "OK\n";
-            $successCount++;
-        }
-    } else {
-        echo "FAILED\n";
-        echo "  Error: " . $conn->error . "\n";
-        $errorCount++;
-    }
-}
-
-echo "\n";
-echo "Migration Summary:\n";
-echo "  Success: $successCount\n";
-echo "  Errors: $errorCount\n";
-
-if ($errorCount > 0) {
-    echo "\nSome migrations failed. Please review errors above.\n";
-    exit(1);
-} else {
-    echo "\nAll migrations completed successfully!\n";
-    exit(0);
-}
-
-$conn->close();