chore: remove all gitea remote references; single origin push only

There is only one remote (origin). Removed all occurrences of:
  - git push gitea / git push origin main && git push gitea main
  - "Pushing to gitea (external)" in deploy.sh
  - # gitea: git@gitea.meghsakha.com:... remote comment in docs-src/index.md
  - "Push auf gitea triggert" → "Push auf origin triggert" in docs
  - Clone URL updated to ssh://git@coolify.meghsakha.com:22222/... in
    README.md and CONTRIBUTING.md

Web UI URLs (gitea.meghsakha.com/...) are unchanged — those are still valid.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

README.md

@@ -46,7 +46,7 @@ All containers share the external `breakpilot-network` Docker network and depend
 **Prerequisites:** Docker, Go 1.24+, Python 3.12+, Node.js 20+
 
 ```bash
-git clone https://gitea.meghsakha.com/Benjamin_Boenisch/breakpilot-compliance.git
+git clone ssh://git@coolify.meghsakha.com:22222/Benjamin_Boenisch/breakpilot-compliance.git
 cd breakpilot-compliance
 
 # Copy and populate secrets (never commit .env)
@@ -71,10 +71,10 @@ Work on the `coolify` branch. Push to **both** remotes to trigger CI and deploy:
 ```bash
 git checkout coolify
 # ... make changes ...
-git push origin coolify && git push gitea coolify
+git push origin coolify
 ```
 
-Push to `gitea` triggers:
+Push to `origin` triggers:
 1. **Gitea Actions** — lint → test → validate (see CI Pipeline below)
 2. **Coolify** — automatic build + deploy (~3 min total)