feat: enhanced AI usage logging (model, provider, response) and fixed build blockers

logging_enhancements.sql

@@ -0,0 +1,17 @@
+-- AI Logging Enhancements
+-- Add model, provider and response_text to api_usage table
+
+DO $$ 
+BEGIN
+    IF NOT EXISTS (SELECT 1 FROM INFORMATION_SCHEMA.COLUMNS WHERE TABLE_NAME = 'api_usage' AND COLUMN_NAME = 'model') THEN
+        ALTER TABLE api_usage ADD COLUMN model TEXT;
+    END IF;
+
+    IF NOT EXISTS (SELECT 1 FROM INFORMATION_SCHEMA.COLUMNS WHERE TABLE_NAME = 'api_usage' AND COLUMN_NAME = 'provider') THEN
+        ALTER TABLE api_usage ADD COLUMN provider TEXT;
+    END IF;
+
+    IF NOT EXISTS (SELECT 1 FROM INFORMATION_SCHEMA.COLUMNS WHERE TABLE_NAME = 'api_usage' AND COLUMN_NAME = 'response_text') THEN
+        ALTER TABLE api_usage ADD COLUMN response_text TEXT;
+    END IF;
+END $$;