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

tests/e2e-docker/pipeline-tools.spec.ts

@@ -469,7 +469,7 @@ test.describe("Pipeline edge cases", () => {
             {
               toolId: "watermark-text",
               settings: {
-                text: "ashim",
+                text: "snapotter",
                 fontSize: 20,
                 color: "#808080",
                 opacity: 20,