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>

docs-src/index.md

@@ -92,7 +92,7 @@ Module die Compliance-Kunden im SDK sehen und nutzen:
 
 ```bash
 # Production (Orca — Standardweg):
-git push origin main && git push gitea main
+git push origin main
 # Orca baut und deployt automatisch.
 
 # Lokal (Mac Mini — nur Dev/Tests):
@@ -105,11 +105,11 @@ docker compose -f breakpilot-compliance/docker-compose.yml up -d
 
 ```bash
 # Zwei Remotes - IMMER zu beiden pushen:
-git push origin main && git push gitea main
+git push origin main
 
 # Remotes:
 # origin: http://macmini:3003/pilotadmin/breakpilot-compliance.git
-# gitea:  git@gitea.meghsakha.com:Benjamin_Boenisch/breakpilot-compliance.git
+
 ```
 
 ---