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/sonarr/config/config.xml

@@ -0,0 +1,17 @@
+<Config>
+  <BindAddress>*</BindAddress>
+  <Port>8989</Port>
+  <SslPort>9898</SslPort>
+  <EnableSsl>False</EnableSsl>
+  <LaunchBrowser>True</LaunchBrowser>
+  <ApiKey>2c18b8b22a8a47328c55accb5ba5f093</ApiKey>
+  <AuthenticationMethod>Forms</AuthenticationMethod>
+  <AuthenticationRequired>Enabled</AuthenticationRequired>
+  <Branch>main</Branch>
+  <LogLevel>info</LogLevel>
+  <SslCertPath></SslCertPath>
+  <SslCertPassword></SslCertPassword>
+  <UrlBase></UrlBase>
+  <InstanceName>Sonarr</InstanceName>
+  <UpdateMechanism>Docker</UpdateMechanism>
+</Config>