feat: categories, runtime nav, and UX updates

scripts/schema.sql

@@ -29,6 +29,21 @@ CREATE TABLE user_service_access (
   UNIQUE (user_id, service_id)
 );
 
+CREATE TABLE categories (
+  id SERIAL PRIMARY KEY,
+  name VARCHAR(128) NOT NULL UNIQUE,
+  slug VARCHAR(64) NOT NULL UNIQUE,
+  created_at TIMESTAMPTZ NOT NULL DEFAULT now()
+);
+
+CREATE TABLE service_categories (
+  id SERIAL PRIMARY KEY,
+  service_id INT NOT NULL REFERENCES services(id) ON DELETE CASCADE,
+  category_id INT NOT NULL REFERENCES categories(id) ON DELETE CASCADE,
+  created_at TIMESTAMPTZ NOT NULL DEFAULT now(),
+  UNIQUE (service_id, category_id)
+);
+
 CREATE TABLE sessions (
   id UUID PRIMARY KEY,
   user_id INT NOT NULL REFERENCES users(id) ON DELETE CASCADE,