fix: remove unused FEDORA_CADDY_IP from validation and wizard

No phase script deploys Caddy on Fedora — only Unraid gets a Caddy
container. Removed from .env.example, validation arrays, preflight
required vars, IP ping check, wizard prompts, and doc references.

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

lib/common.sh

@@ -209,7 +209,7 @@ _ENV_VAR_NAMES=(
   UNRAID_MACVLAN_PARENT UNRAID_MACVLAN_SUBNET UNRAID_MACVLAN_GATEWAY
   UNRAID_MACVLAN_IP_RANGE UNRAID_GITEA_IP UNRAID_CADDY_IP
   FEDORA_MACVLAN_PARENT FEDORA_MACVLAN_SUBNET FEDORA_MACVLAN_GATEWAY
-  FEDORA_MACVLAN_IP_RANGE FEDORA_GITEA_IP FEDORA_CADDY_IP
+  FEDORA_MACVLAN_IP_RANGE FEDORA_GITEA_IP
   GITEA_ADMIN_USER GITEA_ADMIN_PASSWORD GITEA_ADMIN_EMAIL
   GITEA_ORG_NAME GITEA_INSTANCE_NAME GITEA_DB_TYPE GITEA_VERSION ACT_RUNNER_VERSION
   GITEA_DOMAIN GITEA_INTERNAL_URL
@@ -231,7 +231,7 @@ _ENV_VAR_TYPES=(
   nonempty nonempty ip
   nonempty ip ip
   nonempty nonempty ip
-  nonempty ip ip
+  nonempty ip
   nonempty password email
   nonempty nonempty db_type nonempty nonempty
   nonempty url
@@ -564,6 +564,53 @@ render_template() {
   envsubst "$vars" < "$src" > "$dest"
 }
 
+# ---------------------------------------------------------------------------
+# Template block helpers — conditional block stripping and DB-specific vars
+# ---------------------------------------------------------------------------
+
+# Strip conditional blocks from a rendered file.
+# Usage: strip_template_block <file> <start_marker> <end_marker>
+strip_template_block() {
+  local file="$1" start="$2" end="$3"
+  sed -i.bak "/${start}/,/${end}/d" "$file"
+  rm -f "${file}.bak"
+}
+
+# Set DB-specific variables for docker-compose template rendering.
+# Requires GITEA_DB_TYPE, GITEA_DB_USER, GITEA_DB_PASSWD, GITEA_DB_NAME in env.
+# Exports: DB_DOCKER_IMAGE, DB_ENV_VARS, DB_HEALTHCHECK, DB_DATA_DIR
+set_db_vars() {
+  case "${GITEA_DB_TYPE}" in
+    postgres)
+      DB_DOCKER_IMAGE="postgres:16-alpine"
+      DB_ENV_VARS="      - POSTGRES_USER=${GITEA_DB_USER}
+      - POSTGRES_PASSWORD=${GITEA_DB_PASSWD}
+      - POSTGRES_DB=${GITEA_DB_NAME}"
+      DB_HEALTHCHECK='["CMD-SHELL", "pg_isready -U '"${GITEA_DB_USER}"'"]'
+      DB_DATA_DIR="postgresql/data"
+      ;;
+    mysql)
+      DB_DOCKER_IMAGE="mysql:8.0"
+      DB_ENV_VARS="      - MYSQL_ROOT_PASSWORD=${GITEA_DB_PASSWD}
+      - MYSQL_DATABASE=${GITEA_DB_NAME}
+      - MYSQL_USER=${GITEA_DB_USER}
+      - MYSQL_PASSWORD=${GITEA_DB_PASSWD}"
+      DB_HEALTHCHECK='["CMD", "mysqladmin", "ping", "-h", "localhost"]'
+      DB_DATA_DIR="mysql"
+      ;;
+    mssql)
+      DB_DOCKER_IMAGE="mcr.microsoft.com/mssql/server:2022-latest"
+      DB_ENV_VARS="      - ACCEPT_EULA=Y
+      - SA_PASSWORD=${GITEA_DB_PASSWD}"
+      # shellcheck disable=SC2089,SC2016
+      DB_HEALTHCHECK='["CMD-SHELL", "/opt/mssql-tools18/bin/sqlcmd -S localhost -U sa -P '"'"'${GITEA_DB_PASSWD}'"'"' -Q \"SELECT 1\" -C -N"]'
+      DB_DATA_DIR="mssql/data"
+      ;;
+  esac
+  # shellcheck disable=SC2090
+  export DB_DOCKER_IMAGE DB_ENV_VARS DB_HEALTHCHECK DB_DATA_DIR
+}
+
 # ---------------------------------------------------------------------------
 # Polling / waiting
 # ---------------------------------------------------------------------------