feat: Add Token Management UI

- Add SettingsTokens view at /settings/tokens
- Add TokenManager modal component for creating tokens
- Add token management functions to auth store (fetchTokens, generateToken, revokeToken)
- Add Settings link in header user dropdown
- Add ApiToken types to types/index.ts
- Route: GET /auth/tokens, POST /auth/token/generate, DELETE /auth/tokens/{id}

src/types/index.ts

@@ -234,3 +234,24 @@ export interface TagForm {
   name: string
   color: string
 }
+
+// API Token types
+export type TokenRole = 'researcher' | 'developer' | 'viewer'
+
+export interface ApiToken {
+  id: string
+  name: string
+  role: TokenRole
+  created_at: string
+}
+
+export interface ApiTokenGenerateResponse {
+  token: string
+  name: string
+  role: TokenRole
+}
+
+export interface ApiTokenCreate {
+  name: string
+  role: TokenRole
+}