feat: add Category, Make, Disney Park to filter panel dropdowns with backend endpoints

server.py

@@ -837,6 +837,26 @@ def list_users():
     return [dict(r) for r in rows]
 
 
+@app.get("/api/categories")
+def list_categories():
+    conn = get_db()
+    rows = conn.execute(
+        "SELECT DISTINCT category FROM assets WHERE category IS NOT NULL AND category != '' ORDER BY category"
+    ).fetchall()
+    conn.close()
+    return [r["category"] for r in rows]
+
+
+@app.get("/api/makes")
+def list_makes():
+    conn = get_db()
+    rows = conn.execute(
+        "SELECT DISTINCT make FROM assets WHERE make IS NOT NULL AND make != '' ORDER BY make"
+    ).fetchall()
+    conn.close()
+    return [r["make"] for r in rows]
+
+
 # ─── Task 4: POST /api/assets ──────────────────────────────────────────────