refactor(canvas): 节点注册表 - 收敛素材类型、生成模式与输入计数判据

把三条按类型分支的语义判据收进注册表：
- resourceKind  原 canvas-resource-references.ts，作为 @ 引用素材时的类型
- generationMode 原 canvas-connection-policy.ts，作为生成节点时的模式
- inputKind     原 canvas-connection-policy.ts，被容量校验计数时的类别

resourceKind 与 inputKind 刻意分成两个字段：它们语义不同——空图片节点不是素材
（不进 @ 引用），但照样计入 imageCount。合成一个会静默改掉连线容量校验。

两处必须保住的语义，均已由测试钉住：
1. 角色卡（workflowKind === character）是跨类型覆盖，对任何节点类型生效，
   属于查注册表之前的前置判定，因此留在调用点而不进 per-type 定义。
2. 排除必须早于覆盖。原实现先 return 掉生成配置与背板，之后才判角色卡；
   若把角色卡判定提前，带角色元数据的配置/背板节点会被多算成 characterCount。

新增 test/canvas-node-registry.test.ts（19 用例 / 77 断言）并加入 package.json
的 test 列表——该列表是显式枚举，不加进去文件不会跑。补测的原因是
canvas-resource-references.test.ts 只覆盖 collectUpstreamVideoNodes，
本次改动的 resourceKind 此前零覆盖，而这类判据出错不报错、只会让 @ 引用少收素材。

顺带内联 nodeGenerationMode（迁移后退化为单行转发）。

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

web/package.json

@@ -7,7 +7,7 @@
         "dev": "vite --host 0.0.0.0 --port 3000",
         "build": "tsc --noEmit && vite build",
         "typecheck": "tsc --noEmit",
-        "test": "bun test test/channel-model-catalog.test.ts test/agent-prompt-cache.test.ts test/canvas-batch-connection.test.ts test/canvas-character-reference.test.ts test/canvas-document.test.ts test/canvas-drawing-engine.test.ts test/canvas-emotion-edit-plan.test.ts test/canvas-generation-layout.test.ts test/canvas-image-batch-retry.test.ts test/canvas-leafer-viewport.test.ts test/canvas-local-runtime.test.ts test/canvas-model-policy.test.ts test/canvas-resource-references.test.ts test/canvas-storyboard-references.test.ts test/canvas-node-config-reset.test.ts test/canvas-video-regeneration.test.ts test/canvas-video-timeline-segments.test.ts test/create-canvas-handoff.test.ts test/create-library-button.test.ts test/creation-references.test.ts test/generation-asset-repository.node.test.ts test/generation-storage-consistency.test.ts test/generation-task-durability.node.test.ts test/generation-task-local.test.ts test/generation-task-materializer.test.ts test/user-scoped-generation-persistence.test.ts test/local-channel-permission.test.ts test/local-channel-runtime-projection.node.test.mjs test/local-channel-task-center.node.test.mjs test/local-channel-ui.node.test.mjs test/local-cli-settings.test.ts test/local-dreamina-cli.test.ts test/local-dreamina-generation.test.ts test/local-dreamina-model-catalog.test.ts test/local-runtime-bootstrap.test.ts test/local-runtime-connection.test.ts test/local-runtime.test.ts test/client-id.test.ts test/grok-image-prompt-limit.test.ts test/image-resolution-tiers.test.ts test/gemini-image.test.ts test/libtv-import.test.ts test/timeline-to-ffmpeg.test.ts test/canvas-video-segment-args.test.ts test/tapnow-import.test.ts && bun test test/local-dreamina-cross-runtime.test.ts",
+        "test": "bun test test/channel-model-catalog.test.ts test/agent-prompt-cache.test.ts test/canvas-batch-connection.test.ts test/canvas-character-reference.test.ts test/canvas-document.test.ts test/canvas-drawing-engine.test.ts test/canvas-emotion-edit-plan.test.ts test/canvas-generation-layout.test.ts test/canvas-image-batch-retry.test.ts test/canvas-leafer-viewport.test.ts test/canvas-local-runtime.test.ts test/canvas-model-policy.test.ts test/canvas-resource-references.test.ts test/canvas-storyboard-references.test.ts test/canvas-node-config-reset.test.ts test/canvas-node-registry.test.ts test/canvas-video-regeneration.test.ts test/canvas-video-timeline-segments.test.ts test/create-canvas-handoff.test.ts test/create-library-button.test.ts test/creation-references.test.ts test/generation-asset-repository.node.test.ts test/generation-storage-consistency.test.ts test/generation-task-durability.node.test.ts test/generation-task-local.test.ts test/generation-task-materializer.test.ts test/user-scoped-generation-persistence.test.ts test/local-channel-permission.test.ts test/local-channel-runtime-projection.node.test.mjs test/local-channel-task-center.node.test.mjs test/local-channel-ui.node.test.mjs test/local-cli-settings.test.ts test/local-dreamina-cli.test.ts test/local-dreamina-generation.test.ts test/local-dreamina-model-catalog.test.ts test/local-runtime-bootstrap.test.ts test/local-runtime-connection.test.ts test/local-runtime.test.ts test/client-id.test.ts test/grok-image-prompt-limit.test.ts test/image-resolution-tiers.test.ts test/gemini-image.test.ts test/libtv-import.test.ts test/timeline-to-ffmpeg.test.ts test/canvas-video-segment-args.test.ts test/tapnow-import.test.ts && bun test test/local-dreamina-cross-runtime.test.ts",
         "start": "vite preview --host 0.0.0.0 --port 3000",
         "format": "prettier --write .",
         "format:check": "prettier --check ."