✨ Add feature flags configuration for Pokedex Online

code/websites/pokedex.online/src/config/feature-flags.js

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+/**
+ * Feature Flags Configuration
+ *
+ * Defines all feature flags with metadata.
+ * Uses build-time obfuscation for production security.
+ *
+ * Pattern:
+ * - Development: Flags easily toggled via Developer Tools (Ctrl+Shift+D)
+ * - Production: Flags obfuscated and require permission-based backend query
+ * - All flags checked at runtime via useFeatureFlags composable
+ *
+ * Usage in components:
+ * ```javascript
+ * const { isEnabled } = useFeatureFlags();
+ * if (isEnabled('experimental-search')) { ... }
+ * ```
+ */
+
+export const FEATURE_FLAGS = {
+  // Gamemaster Explorer Features
+  EXPERIMENTAL_SEARCH: {
+    name: 'experimental-search',
+    description: 'Enable experimental search with regex support',
+    enabled: false,
+    requiredPermission: null,
+    tags: ['gamemaster', 'search']
+  },
+
+  GAMEMASTER_DIFF_VIEWER: {
+    name: 'gamemaster-diff-viewer',
+    description: 'Enable diff viewer for gamemaster file comparisons',
+    enabled: false,
+    requiredPermission: 'gamemaster-advanced',
+    tags: ['gamemaster', 'ui']
+  },
+
+  GAMEMASTER_BOOKMARKS: {
+    name: 'gamemaster-bookmarks',
+    description: 'Enable bookmarking feature for favorite gamemasters',
+    enabled: false,
+    requiredPermission: null,
+    tags: ['gamemaster', 'storage']
+  },
+
+  // Challonge Test Features
+  CHALLONGE_CACHED_TOURNAMENTS: {
+    name: 'challonge-cached-tournaments',
+    description: 'Cache tournament data for faster loading',
+    enabled: false,
+    requiredPermission: 'challonge-advanced',
+    tags: ['challonge', 'performance']
+  },
+
+  CHALLONGE_EXPORT_CSV: {
+    name: 'challonge-export-csv',
+    description: 'Allow exporting tournament data to CSV',
+    enabled: false,
+    requiredPermission: null,
+    tags: ['challonge', 'export']
+  },
+
+  // Developer/Admin Features
+  DEVELOPER_TOOLS: {
+    name: 'developer-tools',
+    description: 'Show developer tools panel (Ctrl+Shift+D)',
+    enabled: process.env.NODE_ENV === 'development',
+    requiredPermission: null,
+    tags: ['developer']
+  },
+
+  ADMIN_PANEL: {
+    name: 'admin-panel',
+    description: 'Show admin panel with system information',
+    enabled: false,
+    requiredPermission: 'admin',
+    tags: ['admin', 'maintenance']
+  },
+
+  // Performance Features
+  ENABLE_CACHING: {
+    name: 'enable-caching',
+    description: 'Enable client-side caching for API responses',
+    enabled: true,
+    requiredPermission: null,
+    tags: ['performance']
+  },
+
+  // UI Features
+  DARK_MODE: {
+    name: 'dark-mode',
+    description: 'Enable dark mode theme',
+    enabled: false,
+    requiredPermission: null,
+    tags: ['ui', 'theme']
+  }
+};
+
+/**
+ * Get all feature flags
+ * @returns {Object} All feature flags
+ */
+export function getAllFlags() {
+  return FEATURE_FLAGS;
+}
+
+/**
+ * Get flag by name
+ * @param {string} name - Flag name
+ * @returns {Object|null} Flag object or null if not found
+ */
+export function getFlag(name) {
+  return Object.values(FEATURE_FLAGS).find(flag => flag.name === name) || null;
+}
+
+/**
+ * Get all flags for a specific tag
+ * @param {string} tag - Tag name
+ * @returns {Object[]} Array of flags with the tag
+ */
+export function getFlagsByTag(tag) {
+  return Object.values(FEATURE_FLAGS).filter(flag => flag.tags.includes(tag));
+}
+
+/**
+ * Check if flag requires specific permission
+ * @param {string} name - Flag name
+ * @returns {string|null} Required permission or null if no permission required
+ */
+export function getFlagPermission(name) {
+  const flag = getFlag(name);
+  return flag ? flag.requiredPermission : null;
+}