Studio: make grid checkbox rectangular and commit table changes

config/recommendations.php

@@ -89,4 +89,47 @@ return [
             explode(',', (string) env('RECOMMENDATIONS_AB_ALGO_VERSIONS', env('RECOMMENDATIONS_ALGO_VERSION', 'clip-cosine-v1')))
         ))),
     ],
+
+    // ─── Similar Artworks (hybrid recommender) ─────────────────────────────────
+    'similarity' => [
+        'model_version' => env('SIMILARITY_MODEL_VERSION', 'sim_v1'),
+
+        // Vector DB integration (behind feature flag)
+        'vector_enabled' => (bool) env('SIMILARITY_VECTOR_ENABLED', false),
+        'vector_adapter' => env('SIMILARITY_VECTOR_ADAPTER', 'pgvector'), // pgvector | pinecone
+
+        // Hybrid blend weights (spec §5.4)
+        'weights_with_vector' => [
+            'visual'   => (float) env('SIM_W_VISUAL',   0.45),
+            'tag'      => (float) env('SIM_W_TAG_VEC',  0.25),
+            'behavior' => (float) env('SIM_W_BEH_VEC',  0.20),
+            'category' => (float) env('SIM_W_CAT_VEC',  0.10),
+        ],
+        'weights_without_vector' => [
+            'tag'      => (float) env('SIM_W_TAG',      0.55),
+            'behavior' => (float) env('SIM_W_BEH',      0.35),
+            'category' => (float) env('SIM_W_CAT',      0.10),
+        ],
+
+        // Diversity caps (spec §6)
+        'max_per_author'      => (int) env('SIM_MAX_PER_AUTHOR', 2),
+        'result_limit'        => (int) env('SIM_RESULT_LIMIT', 30),
+        'candidate_pool'      => (int) env('SIM_CANDIDATE_POOL', 100),
+        'min_categories_top12' => (int) env('SIM_MIN_CATS_TOP12', 2),
+
+        // Behavior pair building
+        'user_favourites_cap' => (int) env('SIM_USER_FAV_CAP', 50),
+
+        // Cache TTL for precomputed lists (sec)
+        'cache_ttl'           => (int) env('SIM_CACHE_TTL', 6 * 3600),
+
+        // Pinecone adapter settings
+        'pinecone' => [
+            'api_key'    => env('PINECONE_API_KEY'),
+            'index_host' => env('PINECONE_INDEX_HOST'),
+            'index_name' => env('PINECONE_INDEX_NAME', 'skinbase-artworks'),
+            'namespace'  => env('PINECONE_NAMESPACE', ''),
+            'top_k'      => (int) env('PINECONE_TOP_K', 100),
+        ],
+    ],
 ];