docs: add Manual.md — end-to-end setup guide

Step-by-step deployment guide: prerequisites, Tailscale, git clone,
sparse checkout, master.conf/host*.conf config, SSH keys via ssh_setup.sh,
Arbiter cron table, initial sync, fallback enable, partnership onboard,
verification, and common first-run troubleshooting.

Fixes the broken README-Rsync_Setup.md reference in README.md.

README.md

@@ -686,7 +686,7 @@ Problem: HOST1 loses power
 If you're setting this up from scratch on two servers:
 
 ```
-1. Follow README-Rsync_Setup.md completely — end-to-end setup guide
+1. Follow Manual.md — end-to-end setup guide
    Tailscale → SSH keys → git clone → master.conf → Arbiter schedule
 
 2. Set your container names correctly before anything else
@@ -718,7 +718,7 @@ If you're setting this up from scratch on two servers:
 | [README-Transcoding.md](Transcodes/README-Transcoding.md) | Ramdisk design, symlink architecture, Docker mount requirement, SSD fallback |
 | [README-Monitors.md](Monitors/README-Monitors.md) | Cert monitoring, SMART health, bandwidth tracking, health digest profiles |
 | [README-Partnership.md](Partnership/README-Partnership.md) | Auth stack sharing, onboard/offboard/transfer lifecycle, deferred offboard |
-| [README-Rsync_Setup.md](Rsync/README-Rsync_Setup.md) | Complete setup guide — Tailscale, SSH keys, git clone, master.conf, Arbiter |
+| [Manual.md](Manual.md) | Complete setup guide — Tailscale, SSH keys, git clone, master.conf, Arbiter |
 | [README-Tools.md](Tools/README-Tools.md) | failover_state_reset, skip list manager, emby_database_repair, container export |
 | [README-Unraid_Essentials.md](unRAID_Essentials/README-Unraid_Essentials.md) | `git_pull_execute.sh`, `server_reboot.sh`, `mover_stop.sh`, `user_scripts_stop.sh` |