docs: Update 2 files

TEMPLATES.md

@@ -11,6 +11,7 @@ template-name/
 ├── template_info.env         # REQUIRED: Template metadata (at root level)
 ├── config/
 │   └── service.env           # REQUIRED: Default service configuration
+├── install-pre.sh            # OPTIONAL: Pre-install script (runs BEFORE uninstall, e.g. docker pull)
 ├── install.sh                # REQUIRED: Installation script
 ├── uninstall.sh              # REQUIRED: Uninstallation script
 ├── status.sh                 # REQUIRED: Check service status (needed for 'dropshell list' command)
@@ -152,7 +153,41 @@ This means:
 - Variables in `service.env` override those in `template_info.env` if they have the same name
 - Users customize deployments by editing `service.env`, never `template_info.env`
 
-### 3. install.sh
+### 3. install-pre.sh (OPTIONAL)
+
+Pre-install script that runs **before the old service is uninstalled**. This is useful for reducing downtime by performing slow operations (like pulling Docker images) while the old service is still running.
+
+**When does it run?**
+- Only when updating an existing service (not on first install)
+- Checked in the local template cache first (fast, no remote calls)
+- Only synced and run on the remote server if the script exists in the template
+
+**If install-pre.sh fails**, installation continues with a warning. It is not considered a fatal error.
+
+```bash
+#!/bin/bash
+source "${AGENT_PATH}/common.sh"
+_check_required_env_vars "IMAGE_REGISTRY" "IMAGE_REPO" "IMAGE_TAG"
+
+# Pull the new Docker image while the old service is still running
+docker pull -q "$IMAGE_REGISTRY/$IMAGE_REPO:$IMAGE_TAG" || echo "Warning: pre-pull failed, install.sh will retry"
+
+echo "Pre-install complete"
+```
+
+**Docker Compose example:**
+```bash
+#!/bin/bash
+source "${AGENT_PATH}/common.sh"
+_check_required_env_vars "CONTAINER_NAME"
+
+# Pull updated images while the old service is still running
+docker compose -p "${CONTAINER_NAME}" pull || echo "Warning: pre-pull failed, install.sh will retry"
+
+echo "Pre-install complete"
+```
+
+### 4. install.sh
 
 Installation script that sets up the service:
 
@@ -182,7 +217,7 @@ bash ./start.sh || _die "Failed to start container"
 echo "Installation of ${CONTAINER_NAME} complete"
 ```
 
-### 4. uninstall.sh
+### 5. uninstall.sh
 
 Uninstallation script to remove the service (must be non-interactive and MUST preserve data):