Restore GET /api/hub/profiles/{username} — still actively used

Datadog shows ~37k req/30d to GET /api/hub/profiles/{username} (getHubProfile)
on comfy-ingest, so it is NOT unused — keep it. Only PUT /api/hub/profiles/me
(updateMyHubProfile) is removed: zero traffic and never implemented.

openapi.yaml

@@ -3690,6 +3690,40 @@ paths:
               schema:
                 $ref: "#/components/schemas/CloudError"
 
+        '500':
+          description: Internal server error
+          content:
+            application/json:
+              schema:
+                $ref: '#/components/schemas/ErrorResponse'
+  /api/hub/profiles/{username}:
+    get:
+      operationId: getHubProfile
+      tags: [hub]
+      summary: Get a hub profile by username
+      description: "[cloud-only] Returns the public hub profile for the given username."
+      x-runtime: [cloud]
+      parameters:
+        - name: username
+          in: path
+          required: true
+          schema:
+            type: string
+          description: Hub username
+      responses:
+        "200":
+          description: Profile
+          content:
+            application/json:
+              schema:
+                $ref: "#/components/schemas/HubProfile"
+        "404":
+          description: Not found
+          content:
+            application/json:
+              schema:
+                $ref: "#/components/schemas/CloudError"
+
         '500':
           description: Internal server error
           content: