feat: remote browser login persistence + balance display + UI consistency

- Retain login state in remote browser profiles (don't delete on disconnect)
- Add GET /api/browser-sessions/{id}/clipboard for clipboard sync
- Add POST /api/browser-sessions/{id}/autofill-login for manual credential fill
- Add DELETE /api/browser-sessions/profiles/{custom_page_id} for login clear
- Add balance tracking with configurable divisor (balance_divisor)
- Health check on session reuse, idle TTL eviction, background cleanup
- Add first-frame watchdog (10s timeout) to prevent infinite loading
- Reconnect browser on active=true when session was closed
- UI: uniform text-only inline buttons (websites + upstreams pages)
- Fix page switch race with closingRemoteSessionPromise

frontend/src/api/index.ts

@@ -59,6 +59,11 @@ export interface UpstreamData {
   last_status: string
   last_checked_at: string | null
   last_error: string | null
+  balance: number | null
+  balance_updated_at: string | null
+  balance_endpoint: string
+  balance_response_path: string
+  balance_divisor: number
   created_at: string
   updated_at: string
 }
@@ -74,6 +79,9 @@ export interface UpstreamForm {
   enabled: boolean
   check_interval_seconds: number
   timeout_seconds: number
+  balance_endpoint: string
+  balance_response_path: string
+  balance_divisor: number
 }
 
 export const upstreamsApi = {
@@ -315,7 +323,10 @@ export const browserSessionsApi = {
   event: (id: string, data: BrowserEventPayload) =>
     api.post<BrowserSessionData>(`/api/browser-sessions/${id}/events`, data),
   selection: (id: string) => api.get<{ text: string }>(`/api/browser-sessions/${id}/selection`),
+  clipboard: (id: string) => api.get<{ text?: string; error?: string }>(`/api/browser-sessions/${id}/clipboard`),
   close: (id: string) => api.delete(`/api/browser-sessions/${id}`),
+  autofillLogin: (id: string) => api.post<{ success: boolean; message: string }>(`/api/browser-sessions/${id}/autofill-login`),
+  clearProfile: (customPageId: number) => api.delete(`/api/browser-sessions/profiles/${customPageId}`),
   screenshotUrl: (id: string, token?: string) => {
     const params = new URLSearchParams({ t: String(Date.now()) })
     if (token) params.set('token', token)