fix(ai-gemini): relocate experimental/ to flattened path + restore vite entry

Main's packages/typescript/* -> packages/* flatten (PR TanStack#643) missed the
experimental/ subtree introduced on this branch — git left it at the
old path and the merged vite.config dropped the experimental entry. Move
the files with `git mv` and re-add the entry so the /experimental subpath
emits its runtime JS again.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Author: tombeckenham

…ript/ai-gemini/src/experimental/index.ts …ages/ai-gemini/src/experimental/index.tspackages/typescript/ai-gemini/src/experimental/index.ts renamed to packages/ai-gemini/src/experimental/index.ts packages/typescript/ai-gemini/src/experimental/index.ts renamed to packages/ai-gemini/src/experimental/index.ts

@@ -29,7 +29,11 @@ const config = defineConfig({
 export default mergeConfig(
   config,
   tanstackViteConfig({
-    entry: ['./src/index.ts', './src/tools/index.ts'],
+    entry: [
+      './src/index.ts',
+      './src/tools/index.ts',
+      './src/experimental/index.ts',
+    ],
     srcDir: './src',
     cjs: false,
   }),