chore: deploy to Cloudflare Pages and update branding

- Add Cloudflare Pages deployment for landing page (snapotter.com) and
  docs (docs.snapotter.com)
- Create deploy-landing.yml and update deploy-docs.yml workflows
- Update CI to ignore apps/landing/** paths
- Fix logo transparency (remove white background) across all apps
- Recreate social-preview.png with SnapOtter branding
- Update all docs URLs from GitHub Pages to docs.snapotter.com
- Update VitePress config: light theme default, fix llms.txt paths
- Add .vitepress/cache/ and .env.* to gitignore

apps/docs/api/ai.md

@@ -1,6 +1,6 @@
 # AI Engine Reference
 
-The `@ashim/ai` package bridges Node.js to a **persistent Python sidecar** for all ML operations. The dispatcher process stays alive between requests for fast warm-start performance. GPU is auto-detected at startup and used when available.
+The `@snapotter/ai` package bridges Node.js to a **persistent Python sidecar** for all ML operations. The dispatcher process stays alive between requests for fast warm-start performance. GPU is auto-detected at startup and used when available.
 
 14 AI tool routes. All models run locally - no internet required after initial model download.
 
@@ -10,7 +10,7 @@ The `@ashim/ai` package bridges Node.js to a **persistent Python sidecar** for a
 Node.js Tool Route
       │
       ▼
- @ashim/ai bridge.ts
+ @snapotter/ai bridge.ts
       │ (stdin/stdout JSON + stderr progress events)
       ▼
  Python dispatcher (persistent process)

apps/docs/api/image-engine.md

@@ -1,6 +1,6 @@
 # Image engine
 
-The `@ashim/image-engine` package handles all non-AI image operations. It wraps [Sharp](https://sharp.pixelplumbing.com/) and runs entirely in-process with no external dependencies.
+The `@snapotter/image-engine` package handles all non-AI image operations. It wraps [Sharp](https://sharp.pixelplumbing.com/) and runs entirely in-process with no external dependencies.
 
 ## Operations