Harden vision vector search and embedding jobs.

Add point search, circuit-breaking, and safer gateway limits so artwork similarity lookups fail closed instead of hanging the request path.

tests/Feature/Vision/AiArtworkSearchApiTest.php

@@ -46,6 +46,7 @@ it('returns AI similar artworks for a public artwork', function (): void {
 
     Http::fake([
         'https://files.skinbase.org/*' => Http::response('image-bytes', 200, ['Content-Type' => 'image/webp']),
+        'https://vision.klevze.net/vectors/search/point' => Http::response(['detail' => 'Point not found'], 404),
         'https://vision.klevze.net/vectors/search/file' => Http::response([
             'results' => [
                 ['id' => $source->id, 'score' => 1.0],
@@ -84,6 +85,7 @@ it('falls back to URL search when the file vector endpoint fails for similar-ai'
 
     Http::fake([
         'https://files.skinbase.org/*' => Http::response('image-bytes', 200, ['Content-Type' => 'image/webp']),
+        'https://vision.klevze.net/vectors/search/point' => Http::response(['detail' => 'Point not found'], 404),
         'https://vision.klevze.net/vectors/search/file' => Http::response(['error' => 'missing endpoint'], 404),
         'https://vision.klevze.net/vectors/search' => Http::response([
             'results' => [
@@ -141,4 +143,4 @@ it('searches by uploaded image through the vector gateway', function (): void {
         return $request->url() === 'https://vision.klevze.net/vectors/search/file'
             && $request->hasHeader('X-API-Key', 'test-key');
     });
-});
+});