Switch to VectorEngine gpt-image-2 and edits

Replace uses of the legacy `gpt-image-2-all` model with `gpt-image-2` and standardize image workflows: no-reference generation uses POST /v1/images/generations, any-reference flows use POST /v1/images/edits with multipart `image` parts. Update SKILLs, generation scripts, decision logs, and docs to reflect the contract change and edits-vs-generations guidance. Apply corresponding changes across backend (api-server match3d/puzzle modules, openai image adapter, mappers, telemetry, spacetime client/module), frontend components and services (Match3D, Puzzle, CreativeImageInputPanel, runtime shells), and add new spritesheet/parser files and tests. Also add media/logo.png. These changes align repository code and documentation with the VectorEngine image API contract and update generation/upload handling (green-screen -> alpha processing, spritesheet handling, and related tests).

server-rs/crates/module-puzzle/src/creative_tools.rs

@@ -172,6 +172,12 @@ pub fn build_puzzle_draft_from_creative_fields(
                 ui_background_prompt: None,
                 ui_background_image_src: None,
                 ui_background_image_object_key: None,
+                level_scene_image_src: None,
+                level_scene_image_object_key: None,
+                ui_spritesheet_image_src: None,
+                ui_spritesheet_image_object_key: None,
+                level_background_image_src: None,
+                level_background_image_object_key: None,
                 background_music: None,
                 candidates: Vec::new(),
                 selected_candidate_id: None,