Add FirePass provider support for Kimi K2.5 Turbo

- Add new 'firepass' provider type alongside anthropic, openai, openrouter
- FirePass uses Fireworks AI's endpoint for Kimi K2.5 Turbo model
- Subscription billing model ($7/week) with 256K context window
- Anthropic API compatible (uses Anthropic SDK with custom baseURL)

Changes:
- providers.ts: Add firepass detection and base URL handling
- auth.ts: Add FirePass API key management (FIREPASS_API_KEY or FIREWORKS_API_KEY)
- config.ts: Add firepassApiKey and firepass auth provider
- client.ts: Add firepass client creation with custom baseURL
- http.ts: Add firepass auth headers
- modelStrings.ts: Return Kimi K2.5 Turbo model ID for firepass
- model.ts: Add Kimi display name handling and default model logic
- modelOptions.ts: Simplified model picker for firepass (Kimi K2.5 Turbo only)
- status.tsx: Display FirePass in status bar
- login.tsx: Add FirePass option to provider selection
- FirepassLoginFlow.tsx: New component for FirePass login flow

Usage:
1. Run /login and select "FirePass"
2. Enter your Fireworks API key
3. Model picker shows Kimi K2.5 Turbo

src/services/api/client.ts

@@ -6,6 +6,7 @@ import {
   getAnthropicApiKey,
   getApiKeyFromApiKeyHelper,
   getClaudeAIOAuthTokens,
+  getFirepassApiKey,
   getOpenAIApiKey,
   getOpenRouterApiKey,
   isClaudeAISubscriber,
@@ -17,6 +18,7 @@ import { getUserAgent } from 'src/utils/http.js'
 import { getSmallFastModel } from 'src/utils/model/model.js'
 import {
   getAPIProvider,
+  getFirepassBaseUrl,
   getOpenAIBaseUrl,
   getOpenRouterBaseUrl,
   isFirstPartyAnthropicBaseUrl,
@@ -316,6 +318,26 @@ export async function getAnthropicClient({
     return new Anthropic(clientConfig)
   }
 
+  if (provider === 'firepass') {
+    // FirePass uses Fireworks AI's Anthropic-compatible endpoint
+    // Requires an active FirePass subscription for the kimi-k2p5-turbo router
+    const firepassKey = apiKey || getFirepassApiKey()
+    if (!firepassKey) {
+      throw new Error(
+        'FirePass provider selected but no FirePass/Fireworks API key is configured. Set FIREPASS_API_KEY or FIREWORKS_API_KEY.',
+      )
+    }
+
+    const clientConfig: ConstructorParameters<typeof Anthropic>[0] = {
+      apiKey: firepassKey,
+      baseURL: getFirepassBaseUrl(),
+      ...ARGS,
+      ...(isDebugToStdErr() && { logger: createStderrLogger() }),
+    }
+
+    return new Anthropic(clientConfig)
+  }
+
   if (provider === 'openai') {
     await refreshOpenAIAuthTokenIfNeeded()
     const openAIKey = apiKey || getOpenAIApiKey()