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/web/src/pages/change-password-page.tsx

@@ -99,7 +99,7 @@ export function ChangePasswordPage() {
       }
 
       // Trigger browser password save prompt via real form submission + navigation
-      const username = localStorage.getItem("ashim-username") || "admin";
+      const username = localStorage.getItem("snapotter-username") || "admin";
       triggerBrowserPasswordSave(username, newPassword);
       return; // navigation happens inside triggerBrowserPasswordSave
     } catch {
@@ -133,7 +133,7 @@ export function ChangePasswordPage() {
                 type="text"
                 name="username"
                 autoComplete="username"
-                value={localStorage.getItem("ashim-username") || "admin"}
+                value={localStorage.getItem("snapotter-username") || "admin"}
                 readOnly
                 className="w-full px-4 py-3 rounded-lg border border-border bg-muted text-muted-foreground cursor-not-allowed"
               />