Remove all Coolify branding, replace with StartAnAiCompany

Users should see this as the "StartAnAiCompany platform" not as a Coolify proxy.

Changes:
- README.md: "StartAnAiCompany infrastructure" and "StartAnAiCompany platform"
- DEPLOYMENT_GUIDE.md: Removed all Coolify references
- deploy-to-apps.example.sh: "deployment platform" instead of "Coolify"

Now all user-facing documentation uses StartAnAiCompany/SAAC branding exclusively.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

deploy-to-apps.example.sh

@@ -64,7 +64,7 @@ fi
 # SAAC API configuration
 SAAC_API="https://apps.startanaicompany.com/api/v1"
 
-# Repository URL (HTTPS for Coolify to clone)
+# Repository URL (HTTPS for deployment platform to clone)
 REPO_URL="https://git.startanaicompany.com/${GITEA_USERNAME}/${GITEA_REPO_NAME}.git"
 
 # Domain (e.g., annarecruit.startanaicompany.com or johnrecruit.startanaicompany.com)