Remove automatic deployment prompt from setup script

Changes:
- scripts/setup-homelab.sh: Remove interactive deployment prompt
  - Users must now run deploy script manually
  - Simplifies both scripts (no sudo workarounds needed)
  - Clearer two-step process: setup then deploy

- Documentation updates:
  - README.md: Updated step 3-4 with manual deployment
  - docs/getting-started.md: Removed step 6 (log out), clarified steps
  - docs/manual-setup.md: Added sudo to deploy command
  - docs/troubleshooting/COMMON-ISSUES.md: Added sudo to all deploy commands

Rationale:
- Automatic deployment via 'su -' cannot work with sudo requirement
- Manual two-step process is clearer and more reliable
- Setup focuses on configuration, deploy focuses on services

docs/manual-setup.md

@@ -210,7 +210,7 @@ If manual setup works, you can switch to the automated scripts for future update
 ```bash
 # Just run the deploy script
 cd ~/AI-Homelab
-./scripts/deploy-homelab.sh
+sudo ./scripts/deploy-homelab.sh
 ```
 
 The deploy script is idempotent - it won't break existing configurations.