Add Prettier formatting and Gitea Actions CI (format, typecheck, test, build)

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_017Qxbkp4tA7G5SCWjzWuxmE

test/types.test-d.ts

@@ -47,12 +47,18 @@ describe('KV types (section 7)', () => {
     db.child('users').child('1').set({ username: 'a', age: 1 })
     // @ts-expect-error wrong value type
     db.child('users').set('1', { username: 'a' })
-    db.child('profile').child('9').setMany([
-      ['age', 3],
-      ['username', 'x'],
-    ])
-    // @ts-expect-error value doesn't match its key
-    db.child('profile').child('9').setMany([['age', 'x']])
+    db.child('profile')
+      .child('9')
+      .setMany([
+        ['age', 3],
+        ['username', 'x'],
+      ])
+    db.child('profile')
+      .child('9')
+      .setMany([
+        // @ts-expect-error value doesn't match its key
+        ['age', 'x'],
+      ])
   })
 
   it('types listings', () => {
@@ -82,7 +88,10 @@ describe('event types', () => {
     orders.child('o1').append([{ type: 'paid' }])
     // @ts-expect-error not an OrderEvent
     orders.append('o1', [{ type: 'refunded' }])
-    orders.child('o1').child('shipments').append('s1', [{ carrier: 'x' }])
+    orders
+      .child('o1')
+      .child('shipments')
+      .append('s1', [{ carrier: 'x' }])
   })
 
   it('types read results', () => {