feat: add BitFun Canvas support

[wgqqqqq]

Summary

• add session-scoped BitFun Canvas tools, runtime, SDK components, and canvas-oriented skills
• add PatchCanvas for exact targeted source edits alongside full-source UpdateCanvas
• improve canvas source reading, runtime diagnostics, element selection references, HTML export, and panel refresh behavior
• preserve aliased and namespace Canvas SDK imports through OXC AST analysis, including runtime bindings for imported aliases
• move Canvas policy import/default-export checks onto OXC AST when the canvas feature is enabled
• diagnose invalid useHostTheme token paths before runtime and queue an agent repair turn when a Canvas runtime failure is reported
• merge latest upstream/main and document BitFun Canvas specialized near-color decisions required by the updated theme audit
• align Canvas SDK action declarations with the runtime host actions and remove full compiled HTML from write-tool results

Verification

• cargo test -p bitfun-core patch_canvas
• cargo test -p bitfun-core shared_coding_mode_tools_include_plan_and_debug_specific_tools
• cargo test -p bitfun-core cowork_mode_includes_init_miniapp_in_default_tools
• cargo test -p bitfun-core claw_mode_includes_init_miniapp_in_default_tools
• cargo test -p bitfun-tool-packs
• cargo test -p bitfun-product-domains --features canvas canvas_compiler -- --nocapture
• cargo test -p bitfun-product-domains --features canvas canvas_compiler_reports_invalid_host_theme_tokens -- --nocapture
• cargo test -p bitfun-product-domains --no-default-features
• cargo test -p bitfun-core create_read_and_update_canvas_round_trip -- --nocapture
• pnpm run check:repo-hygiene
• pnpm run check:github-config
• pnpm run i18n:contract:test:ci
• pnpm run i18n:audit
• pnpm run theme:color-audit:test
• pnpm run theme:color-audit
• pnpm run theme:visual-contract
• pnpm run lint:web
• pnpm run type-check:web
• pnpm --dir src/web-ui run test:run src/tools/bitfun-canvas/runtime/canvasRuntimeInstaller.test.ts
• pnpm --dir src/web-ui run test:run src/tools/bitfun-canvas/BitfunCanvasPanel.test.tsx
• pnpm --dir src/web-ui run test:run
• pnpm run build:web
• pnpm --dir src/mobile-web run type-check
• pnpm run build:mobile-web
• git diff --check

[limityan]

1. 尽可能不增加大量的颜色色值了，复用之前的，现在已经过度膨胀了
2. Commit信息可以合一下，稍有点多
3. 检查一下和docs/architecture/core-decomposition.md文档的一致性关系，要调整一下文件布局