Reorganize repo: one folder per application under apps/.

Move docker/ and configs/ into apps/<name>/ with config/ subfolders.
Proxmox split into hosts/pve and hosts/dell-proxmox. Nginx under
infrastructure/. Update sync script, RESTORE.md, and per-app READMEs.

Co-authored-by: Cursor <cursoragent@cursor.com>

apps/radarr/README.md

@@ -0,0 +1,10 @@
+# Radarr
+
+Config-only (draait op Proxmox LXC).
+
+| | |
+|---|---|
+| **Git** | `config/config.xml` |
+| **NAS** | `/volume1/docker/Configs/Radarr` |
+
+Sync: `sh scripts/sync-from-nas.sh`

apps/radarr/config/config.xml

@@ -0,0 +1,17 @@
+<Config>
+  <BindAddress>*</BindAddress>
+  <Port>7878</Port>
+  <SslPort>9898</SslPort>
+  <EnableSsl>False</EnableSsl>
+  <LaunchBrowser>True</LaunchBrowser>
+  <ApiKey>7f4e4cf5fe444d3cb4170f2e83f984e3</ApiKey>
+  <AuthenticationMethod>Forms</AuthenticationMethod>
+  <AuthenticationRequired>Enabled</AuthenticationRequired>
+  <Branch>master</Branch>
+  <LogLevel>info</LogLevel>
+  <SslCertPath></SslCertPath>
+  <SslCertPassword></SslCertPassword>
+  <UrlBase></UrlBase>
+  <InstanceName>Radarr</InstanceName>
+  <UpdateMechanism>Docker</UpdateMechanism>
+</Config>