feat: marquee tech cards, one-click deploy section, SSH key auth in CI

- Tech grid replaced with infinite marquee (left/right rows)
- New 'One Click Deploy' section with cursor trail animation + deploy cards
- Container padding 24px -> 48px, section-header padding added
- Removed all section-tag spans
- Deploy workflow: password auth -> SSH_PRIVATE_KEY
- discord-section tech-grid with 4-col layout

Author: ddrayko

.github/workflows/deploy.yml

@@ -14,7 +14,7 @@ jobs:
         with:
           host: ${{ secrets.SSH_HOST }}
           username: ${{ secrets.SSH_USER }}
-          password: ${{ secrets.SSH_PASSWORD }}
+          key: ${{ secrets.SSH_PRIVATE_KEY }}
           port: ${{ secrets.SSH_PORT || 22 }}
           script: |
             cd ${{ secrets.HOME_PATH }}