fix: ensure account manager initialized for count_tokens

- Add ensureInitialized() call before count_tokens handler
- Use hybrid approach: local estimation for text, API for images/docs
- This prevents "No accounts available" error on first request

src/cloudcode/count-tokens.js

@@ -278,7 +278,7 @@ export function createCountTokensHandler(accountManager) {
             const result = await countTokens(
                 { messages, model, system, tools, tool_choice, thinking },
                 accountManager,
-                { useAPI: true } // Use API for accurate token counting
+                { useAPI: false } // Use local estimation by default, API for complex content (images/docs)
             );
 
             res.json(result);

src/server.js

@@ -601,7 +601,17 @@ app.get('/v1/models', async (req, res) => {
  * Count tokens endpoint - Anthropic Messages API compatible
  * Uses hybrid approach: local tokenizer for text, API for complex content (images, documents)
  */
-app.post('/v1/messages/count_tokens', createCountTokensHandler(accountManager));
+app.post('/v1/messages/count_tokens', async (req, res) => {
+    try {
+        // Ensure account manager is initialized for API-based counting
+        await ensureInitialized();
+    } catch (error) {
+        // If initialization fails, handler will fall back to local estimation
+        logger.debug(`[TokenCounter] Account manager not initialized: ${error.message}`);
+    }
+
+    return createCountTokensHandler(accountManager)(req, res);
+});
 
 /**
  * Main messages endpoint - Anthropic Messages API compatible