chore: checkpoint web Blender migration source, tools and docs

Accumulated uncommitted work: GHOST Web backend, WebGL/GPU web layer,
web workflow engine and protocol, tooling, docs and task records.
Large generated evidence, user-testing archives, build snapshots and
imported test assets remain untracked.

Co-Authored-By: Claude Code <noreply@anthropic.com>

web/protocol/uv-pack-options.ts

@@ -0,0 +1,22 @@
+export const UV_PACK_ENUMS = {
+  udim_source: ['CLOSEST_UDIM','ACTIVE_UDIM','ORIGINAL_AABB','CUSTOM_REGION'],
+  rotate_method: ['ANY','CARDINAL','AXIS_ALIGNED','AXIS_ALIGNED_X','AXIS_ALIGNED_Y'],
+  margin_method: ['SCALED','ADD','FRACTION'],
+  pin_method: ['SCALE','ROTATION','ROTATION_SCALE','LOCKED'],
+  shape_method: ['CONCAVE','CONVEX','AABB'],
+} as const;
+export const UV_PACK_BOOLEANS = ['rotate','scale','merge_overlap','pin'] as const;
+export type NativeUVPackOptions = Partial<{[K in keyof typeof UV_PACK_ENUMS]: typeof UV_PACK_ENUMS[K][number]} & Record<typeof UV_PACK_BOOLEANS[number],boolean> & {margin:number}>;
+export function parseNativeUVPackOptions(value: unknown): NativeUVPackOptions {
+  if (!value || typeof value !== 'object' || Array.isArray(value) || Object.keys(value).length > 10) throw new Error('UV 打包选项无效');
+  const parsed: Record<string,unknown> = {};
+  for (const [key,option] of Object.entries(value)) {
+    const choices = Object.hasOwn(UV_PACK_ENUMS,key) ? UV_PACK_ENUMS[key as keyof typeof UV_PACK_ENUMS] as readonly string[] : undefined;
+    const valid = choices ? typeof option === 'string' && choices.includes(option)
+      : (UV_PACK_BOOLEANS as readonly string[]).includes(key) ? typeof option === 'boolean'
+      : key === 'margin' && typeof option === 'number' && Number.isFinite(option) && option >= 0 && option <= 1;
+    if (!valid) throw new Error(`UV 打包选项无效：${key}`);
+    parsed[key] = option;
+  }
+  return parsed as NativeUVPackOptions;
+}