chore(netlify): add serverless config and function entry for API

netlify.toml

@@ -0,0 +1,15 @@
+[build]
+  functions = "netlify/functions"
+
+[build.environment]
+  GO_VERSION = "1.22.6"
+
+# Optional: include static assets used by handlers (placeholders, etc.)
+[functions]
+  included_files = ["assets/**", "public/**", "static/**"]
+
+# Route all API requests to the serverless function "api"
+[[redirects]]
+  from = "/api/*"
+  to = "/.netlify/functions/api/:splat"
+  status = 200