docs+scripts: move domain quick tips to docs; add modes overview; clarify full+SNI defaults; add self-signed domain guidance

- deploy.sh: replace verbose public domain test instructions with a single docs link
- docker/scripts/generate-config.sh: remove 'Intranet with TURN quick tip' from help; add docs pointers
- docs(zh/EN): add 'Modes Overview', add 'Private LAN + TURN' quick start example, add 'Domain + Self-signed' and 'Public Domain Quick Test' sections; note LE auto-issue/renew and SNI 443 default in full mode

docker/scripts/generate-config.sh

@@ -139,12 +139,9 @@ Examples:
   # 6) HTTPS + TURN (with domain)
   bash docker/scripts/generate-config.sh --mode full --domain example.com --local-ip 192.168.0.113
 
-Intranet with TURN quick tip (minimal changes):
-  A) One-step (recommended):
-     bash docker/scripts/generate-config.sh --mode private --with-turn --local-ip 192.168.0.113
-     then bash ./deploy.sh --mode private --with-turn
-  B) Step-by-step:
-     Generate private for web/backend first, then docker compose up -d coturn
+For more scenarios and details, see:
+  - docs/DEPLOYMENT_docker.md (English)
+  - docs/DEPLOYMENT_docker.zh-CN.md (中文)
 
 EOF
 }