Update Match3D/image-generation docs & code

Adds/updates documentation, assets and implementation for Match3D and puzzle image generation workflows. Key changes: decision logs and pitfalls updated to prefer VectorEngine Gemini for Match3D material sheets and to require edits (multipart) for 1:1 container reference images; guidance added for when to use APIMart vs VectorEngine. .env.example clarified APIMart/Responses config. Many new public assets and PPT visuals added. Code changes across frontend and backend: updated shared contracts, server-rs match3d/puzzle/image-generation handlers, VectorEngine/OpenAI image generation clients, and multiple React components/tests to handle UI/background/container image signing, edits workflow, and puzzle UI background resolution. Added src/services/puzzle-runtime/puzzleUiBackgroundSource.ts and related test updates. Includes notes about multipart HTTP/1.1 requirement and test/verification commands in docs.

server-rs/crates/api-server/src/asset_billing.rs

@@ -165,6 +165,7 @@ pub(crate) fn should_skip_asset_operation_billing_for_connectivity(
                 || message.contains("Service Unavailable")
                 || message.contains("Failed to connect")
                 || message.contains("WebSocket")
+                || message.contains("No such procedure")
                 || message.contains("连接已断开")
                 || message.contains("连接在返回结果前已断开")
         }
@@ -190,6 +191,11 @@ mod tests {
                 "Failed to connect: HTTP error: 503 Service Unavailable".to_string(),
             ),
         ));
+        assert!(should_skip_asset_operation_billing_for_connectivity(
+            &SpacetimeClientError::Procedure(
+                "No such procedure: consume_profile_wallet_points_and_return".to_string(),
+            ),
+        ));
         assert!(!should_skip_asset_operation_billing_for_connectivity(
             &SpacetimeClientError::Procedure("泥点余额不足".to_string()),
         ));