feat: add landing page and docs website (#537)

* feat: add landing page and docs website package

Add packages/website — a Vue 3 + Naive UI static site with landing page
and documentation, sharing the Pure Ink monochrome design with the main
app. Features: particle network hero animation, screenshot carousel,
feature grid, install guide tabs, GitHub star history, scroll reveal
animations, and Chinese/English bilingual support.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

* chore: add favicon to website package

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

* fix: use dynamic theme param for star history chart

Switch from CSS media query to JS-based dark mode detection so the
star-history SVG matches the current theme toggle state.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

* fix: resolve TypeScript strict mode errors in website components

- Remove unused isDark import in HeroSection
- Add null check for canvas parent element
- Rename unused img loop variable in ScreenshotsSection
- Remove unused NIcon import in SiteHeader

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

* fix: resolve TS narrowing errors in canvas resize closure

Use canvasRef.value directly inside resize() with local null check
instead of relying on outer closure narrowing.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

---------

Co-authored-by: Claude Opus 4.7 <noreply@anthropic.com>

tsconfig.website.json

@@ -0,0 +1,19 @@
+{
+  "extends": "@vue/tsconfig/tsconfig.dom.json",
+  "compilerOptions": {
+    "lib": ["ES2025", "DOM", "DOM.Iterable"],
+    "tsBuildInfoFile": "./node_modules/.tmp/tsconfig.website.tsbuildinfo",
+    "types": ["vite/client"],
+    "ignoreDeprecations": "6.0",
+    "baseUrl": ".",
+    "paths": {
+      "@/*": ["packages/website/src/*"],
+      "@client/*": ["packages/client/src/*"]
+    },
+    "noUnusedLocals": true,
+    "noUnusedParameters": true,
+    "erasableSyntaxOnly": true,
+    "noFallthroughCasesInSwitch": true
+  },
+  "include": ["packages/website/src/**/*.ts", "packages/website/src/**/*.tsx", "packages/website/src/**/*.vue"]
+}