Refactor settings system and improve context initialization

Backend:
- Add type validation and coercion for settings API
- Implement SettingStorage and SettingType in registry
- Improve CRUD operations for settings

Frontend:
- Refactor Theme, Language, Sidebar, ViewMode contexts
- Simplify admin components (GeneralTab, SettingsTab, UsersTab)
- Add new settings endpoints to API client
- Improve App initialization flow

Infrastructure:
- Update Dockerfile and docker-compose.yml
- Add .dockerignore
- Update Makefile and README

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

frontend/src/api/client.ts

@@ -44,13 +44,18 @@ export const authAPI = {
 
 // Settings endpoints
 export const settingsAPI = {
-  getTheme: async (): Promise<Record<string, string>> => {
-    const response = await api.get<Record<string, string>>('/settings/theme');
+  getTheme: async (): Promise<Record<string, unknown>> => {
+    const response = await api.get<Record<string, unknown>>('/settings/theme');
     return response.data;
   },
 
-  updateTheme: async (data: Record<string, string>): Promise<Record<string, string>> => {
-    const response = await api.put<Record<string, string>>('/settings/theme', data);
+  getThemePublic: async (): Promise<Record<string, unknown>> => {
+    const response = await api.get<Record<string, unknown>>('/settings/theme/public');
+    return response.data;
+  },
+
+  updateTheme: async (data: Record<string, unknown>): Promise<Record<string, unknown>> => {
+    const response = await api.put<Record<string, unknown>>('/settings/theme', data);
     return response.data;
   },
 
@@ -63,6 +68,37 @@ export const settingsAPI = {
     const response = await api.put<Record<string, boolean>>('/settings/modules', data);
     return response.data;
   },
+
+  getUi: async (): Promise<Record<string, unknown>> => {
+    const response = await api.get<Record<string, unknown>>('/settings/ui');
+    return response.data;
+  },
+
+  getAllSettings: async (): Promise<Record<string, unknown>> => {
+    const response = await api.get<Record<string, unknown>>('/settings');
+    return response.data;
+  },
+
+  updateSetting: async (key: string, value: unknown): Promise<{ key: string; value: unknown; updated_at: string }> => {
+    const response = await api.put<{ key: string; value: unknown; updated_at: string }>(`/settings/${key}`, { value });
+    return response.data;
+  },
+
+  getUserModeEnabled: async (): Promise<boolean> => {
+    const response = await api.get<{ key: string; value: unknown }>('/settings/user_mode_enabled');
+    const value = response.data?.value;
+    if (value === true || value === 'true' || value === 'True' || value === 1 || value === '1') return true;
+    if (value === false || value === 'false' || value === 'False' || value === 0 || value === '0') return false;
+    return false;
+  },
+
+  updateUserModeEnabled: async (enabled: boolean): Promise<boolean> => {
+    const response = await api.put<{ key: string; value: unknown }>('/settings/user_mode_enabled', { value: enabled });
+    const value = response.data?.value;
+    if (value === true || value === 'true' || value === 'True' || value === 1 || value === '1') return true;
+    if (value === false || value === 'false' || value === 'False' || value === 0 || value === '0') return false;
+    return false;
+  },
 };
 
 // Users endpoints