fix: static IPs for all containers, radicale config, DNS zone, cleanup

- Assign static IPs to all 13 containers (172.20.0.2–13) so DNS zone
  records match actual container IPs regardless of start order.
- Update cell.zone: all .cell domains now point to cell-caddy (172.20.0.2)
  which is the correct single entry point via Caddy reverse proxy.
- Create config/radicale/config so the calendar container actually starts.
- Fix webdav: replace empty users.passwd with USERNAME/PASSWORD env vars.
- Fix DNS fallback IP in wireguard_manager: 172.20.0.2→172.20.0.3 (cell-dns).
- Remove duplicate http://ui.cell from Caddyfile.
- Add persistent data volumes for rainloop and filegator.
- Fix mail domainname placeholder (yourdomain.com→cell.local).

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

docker-compose.yml

@@ -1,7 +1,7 @@
 version: '3.3'
 
 services:
-  # Reverse Proxy - Caddy for TLS termination and routing
+  # Reverse Proxy - Caddy for routing all .cell traffic
   caddy:
     image: caddy:2-alpine
     container_name: cell-caddy
@@ -14,7 +14,8 @@ services:
       - ./config/caddy/certs:/config/caddy/certs
     restart: unless-stopped
     networks:
-      - cell-network
+      cell-network:
+        ipv4_address: 172.20.0.2
 
   # DNS Server - CoreDNS for .cell TLD resolution
   dns:
@@ -29,7 +30,8 @@ services:
       - ./data/dns:/data
     restart: unless-stopped
     networks:
-      - cell-network
+      cell-network:
+        ipv4_address: 172.20.0.3
 
   # DHCP Server - dnsmasq for IP leasing
   dhcp:
@@ -42,7 +44,8 @@ services:
       - ./data/dhcp:/var/lib/misc
     restart: unless-stopped
     networks:
-      - cell-network
+      cell-network:
+        ipv4_address: 172.20.0.4
     command: ["/bin/sh", "-c", "apk add --no-cache dnsmasq && dnsmasq -d -C /etc/dnsmasq.conf"]
     cap_add:
       - NET_ADMIN
@@ -57,7 +60,8 @@ services:
       - ./config/ntp/chrony.conf:/etc/chrony/chrony.conf
     restart: unless-stopped
     networks:
-      - cell-network
+      cell-network:
+        ipv4_address: 172.20.0.5
     command: ["/bin/sh", "-c", "apk add --no-cache chrony && exec chronyd -d -f /etc/chrony/chrony.conf -n"]
 
   # Email Server - Postfix + Dovecot
@@ -65,7 +69,7 @@ services:
     image: mailserver/docker-mailserver:latest
     container_name: cell-mail
     hostname: mail
-    domainname: yourdomain.com         # <-- Set your domain!
+    domainname: cell.local
     env_file: ./config/mail/mailserver.env
     ports:
       - "25:25"
@@ -79,7 +83,8 @@ services:
       - ./config/mail/ssl:/etc/letsencrypt
     restart: unless-stopped
     networks:
-      - cell-network
+      cell-network:
+        ipv4_address: 172.20.0.6
     cap_add:
       - NET_ADMIN
 
@@ -94,7 +99,8 @@ services:
       - ./data/radicale:/data
     restart: unless-stopped
     networks:
-      - cell-network
+      cell-network:
+        ipv4_address: 172.20.0.7
 
   # File Storage - WebDAV
   webdav:
@@ -102,12 +108,16 @@ services:
     container_name: cell-webdav
     ports:
       - "8080:80"
+    environment:
+      - AUTH_TYPE=Basic
+      - USERNAME=admin
+      - PASSWORD=admin123
     volumes:
       - ./data/files:/var/lib/dav
-      - ./config/webdav/users.passwd:/etc/users.passwd
     restart: unless-stopped
     networks:
-      - cell-network
+      cell-network:
+        ipv4_address: 172.20.0.8
 
   # WireGuard VPN
   wireguard:
@@ -124,7 +134,8 @@ services:
       - /lib/modules:/lib/modules
     restart: unless-stopped
     networks:
-      - cell-network
+      cell-network:
+        ipv4_address: 172.20.0.9
     cap_add:
       - NET_ADMIN
       - SYS_MODULE
@@ -132,7 +143,7 @@ services:
       - net.ipv4.conf.all.src_valid_mark=1
       - net.ipv4.ip_forward=1
 
-  # CLI API Server
+  # API Server
   api:
     build: ./api
     container_name: cell-api
@@ -146,7 +157,8 @@ services:
       - /var/run/docker.sock:/var/run/docker.sock
     restart: unless-stopped
     networks:
-      - cell-network
+      cell-network:
+        ipv4_address: 172.20.0.10
     depends_on:
       - wireguard
       - dns
@@ -159,31 +171,38 @@ services:
       - "8081:80"
     restart: unless-stopped
     networks:
-      - cell-network
+      cell-network:
+        ipv4_address: 172.20.0.11
 
+  # Webmail - RainLoop
   rainloop:
     image: hardware/rainloop
     container_name: cell-rainloop
     restart: unless-stopped
     networks:
-      - cell-network
+      cell-network:
+        ipv4_address: 172.20.0.12
     ports:
       - "8888:8888"
+    volumes:
+      - ./data/rainloop:/rainloop/data
 
+  # File Manager - FileGator
   filegator:
     image: filegator/filegator
     container_name: cell-filegator
     restart: unless-stopped
     networks:
-      - cell-network
+      cell-network:
+        ipv4_address: 172.20.0.13
     ports:
       - "8082:8080"
-    environment:
-      - FG_PUBLIC_PATH=/files-ui
+    volumes:
+      - ./data/filegator:/var/www/filegator/private
 
 networks:
   cell-network:
     driver: bridge
     ipam:
       config:
-        - subnet: 172.20.0.0/16 
+        - subnet: 172.20.0.0/16