feat: migrate to OpenCode SDK v2

Update all import statements to use @opencode-ai/sdk/v2
Modify Vite configurations to alias new SDK path
Update API client method signatures for SDK v2 compatibility

vite.config.ts

@@ -12,10 +12,10 @@ export default defineConfig({
     themeStoragePlugin(),
   ],
   resolve: {
-    alias: {
-      '@': path.resolve(__dirname, './src'),
-      '@opencode-ai/sdk': path.resolve(__dirname, './node_modules/@opencode-ai/sdk/dist/client.js'),
-    },
+    alias: [
+      { find: '@opencode-ai/sdk/v2', replacement: path.resolve(__dirname, './node_modules/@opencode-ai/sdk/dist/v2/client.js') },
+      { find: '@', replacement: path.resolve(__dirname, './src') },
+    ],
   },
   worker: {
     format: 'es',
@@ -25,7 +25,7 @@ export default defineConfig({
     global: 'globalThis',
   },
   optimizeDeps: {
-    include: ['@opencode-ai/sdk'],
+    include: ['@opencode-ai/sdk/v2'],
   },
   build: {
     chunkSizeWarningLimit: 1200,