fix: support dense_vector from ES fields response (ES 9.x compatibility) (#13972)

fix: support dense_vector from ES fields response (ES 9.x compatibility)

- [x] Bug Fix (non-breaking change which fixes an issue)
- [x] Configuration Chore (non-breaking change which updates
configuration)


## Summary by CodeRabbit

* **Bug Fixes**
* More accurate handling and unwrapping of dense-vector fields so
returned values have correct shapes.
* Field selection reliably limits returned data and falls back to
alternate result locations when needed.
* Use of consistent result IDs and tolerant handling when score values
are missing.

* **Chores / Configuration**
* Increased build memory and adjusted build-time flags for the frontend
build.
* Simplified runtime model/GPU checks and removed an automated runtime
GPU-install attempt.

* **Build Fixes**
* `web/vite.config.ts`: make `build.minify` and `build.sourcemap`
respect `VITE_MINIFY` and `VITE_BUILD_SOURCEMAP` env vars from
Dockerfile instead of hardcoding `terser` and `true`.

* **Environment**
* Allow stack version override and default the runtime image tag to
"latest".

<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->

## Summary by CodeRabbit

* **Bug Fixes**
* Correct unwrapping of dense-vector fields and reliable field selection
with fallback locations.
* Consistent use of hit-level IDs and tolerant handling when score
values are missing.

* **Chores / Configuration**
* Increased frontend build memory and added build-time minify/sourcemap
flags; build minification and sourcemap now configurable.
* Removed runtime GPU detection for model initialization; force CPU
initialization.

* **Environment**
* Allow stack version override and default runtime image tag to
"latest".

<!-- end of auto-generated comment: release notes by coderabbit.ai -->

---------

Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>

web/vite.config.ts

@@ -26,6 +26,17 @@ const inspectorBabelPlugin = (): import('vite').Plugin => ({
   },
 });
 
+type MinifyValue = boolean | 'esbuild' | 'terser';
+
+function resolveMinify(value: string | undefined): MinifyValue {
+  if (value === undefined) return 'terser';
+  const lower = value.toLowerCase();
+  if (lower === 'false') return false;
+  if (lower === 'esbuild') return 'esbuild';
+  if (lower === 'terser') return 'terser';
+  return 'terser';
+}
+
 // https://vitejs.dev/config/
 export default defineConfig(({ mode }) => {
   const env = loadEnv(mode, process.cwd(), '');
@@ -229,7 +240,7 @@ export default defineConfig(({ mode }) => {
         plugins: [],
         treeshake: true,
       },
-      minify: 'terser',
+      minify: resolveMinify(env.VITE_MINIFY),
       terserOptions: {
         compress: {
           drop_console: true, // delete console
@@ -246,7 +257,7 @@ export default defineConfig(({ mode }) => {
           comments: false, // Delete comments
         },
       },
-      sourcemap: true,
+      sourcemap: env.VITE_BUILD_SOURCEMAP !== 'false',
       cssCodeSplit: true,
       target: 'es2015',
     },