build: fix doinst.sh compatibility with installpkg --root (#1446)

- Isolate plugin concerns into `.plg` plugin & api file modifiers instead of the api's
slackware package.

## Summary by CodeRabbit

* **New Features**
* Installation process modularized into package installation,
post-install setup with verification, and service startup with cleanup.
* Added logging and error detection during installation, including
symlink verification.
  * Created required log directory to support service dependencies.
* Integrated nginx service with reload capability triggered by
configuration changes.
* Added automatic patching of nginx configuration and hosts file to
improve security and iframe compatibility.
* Enhanced file modification system to handle side effects and trigger
nginx reloads as needed.

* **Refactor**
* Restructured installation scripts for clarity; setup scripts now
separate steps.
  * Removed legacy installation logic and deprecated related scripts.
  * Enabled hard link addition during package creation.
* Simplified installation scripts by removing conditional branching and
detailed logging.
* Streamlined API environment setup by removing redundant post-install
steps.
* Updated dependency injection to explicitly provide nginx service
token.
  * Improved patch application error reporting with file path details.

* **Chores**
  * Disabled legacy scripts to streamline installation.
  * Removed `.gitignore` to track previously ignored files.
* Updated tests to include new dependencies and relaxed logger
assertions.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->

---
- To see the specific tasks where the Asana app for GitHub is being
used, see below:
  - https://app.asana.com/0/0/1210661184127051

plugin/plugins/dynamix.unraid.net.plg

@@ -210,7 +210,7 @@ exit 0
     </INLINE>
   </FILE>
 
-  <!-- install all the things -->
+  <!-- install api package and all necessary files -->
   <FILE Run="/bin/bash" Method="install">
     <INLINE>
       TAG="&tag;" 
@@ -242,17 +242,69 @@ if [ $? -ne 0 ]; then
   exit 1
 fi
 
-# Clean up any old node_modules archives (on the boot drive) that don't match our current version
-#
-# Must run after package installation because it provides an update api config file,
-# which determines the current API version and vendor archive to keep.
-/etc/rc.d/rc.unraid-api cleanup-dependencies
-
 if [[ -n "$TAG" && "$TAG" != "" ]]; then
   printf -v sedcmd 's@^\*\*Unraid Connect\*\*@**Unraid Connect (%s)**@' "$TAG"
   sed -i "${sedcmd}" "/usr/local/emhttp/plugins/dynamix.unraid.net/README.md"
 fi
 
+exit 0
+]]>
+    </INLINE>
+  </FILE>
+
+  <!-- port of the old doinst.sh script -->
+  <FILE Run="/bin/bash" Method="install">
+    <INLINE>
+      <![CDATA[
+SCRIPTS_DIR="/usr/local/share/dynamix.unraid.net/install/scripts"
+# Log file for debugging
+LOGFILE="/var/log/unraid-api/dynamix-unraid-install.log"
+mkdir -p "$(dirname "$LOGFILE")"
+
+echo "Starting Unraid Connect installation..."
+
+# Move settings on flash drive
+CFG_OLD=/boot/config/plugins/Unraid.net
+CFG_NEW=/boot/config/plugins/dynamix.my.servers
+[ -d "$CFG_OLD" ] && [ ! -d "$CFG_NEW" ] && mv "$CFG_OLD" "$CFG_NEW"
+
+# Setup the API (but don't start it yet)
+if [ -x "$SCRIPTS_DIR/setup_api.sh" ]; then
+  echo "Setting up Unraid API..."
+  echo "Running setup_api.sh" >> "$LOGFILE"
+  # Capture output and add to log file
+  setup_output=$("$SCRIPTS_DIR/setup_api.sh")
+  echo "$setup_output" >> "$LOGFILE"
+else
+  echo "ERROR: setup_api.sh not found or not executable" >> "$LOGFILE"
+fi
+
+# Run post-installation verification
+if [ -x "$SCRIPTS_DIR/verify_install.sh" ]; then
+  echo "Running post-installation verification..."
+  echo "Running verify_install.sh" >> "$LOGFILE"
+  # Capture output and add to log file
+  verify_output=$("$SCRIPTS_DIR/verify_install.sh")
+  echo "$verify_output" >> "$LOGFILE"
+else
+  echo "ERROR: verify_install.sh not found or not executable" >> "$LOGFILE"
+fi
+
+echo "Installation completed at $(date)" >> "$LOGFILE"
+      ]]>
+    </INLINE>
+  </FILE>
+
+  <!-- start the unraid api service -->
+  <FILE Run="/bin/bash" Method="install">
+    <INLINE>
+      <![CDATA[
+# Clean up any old node_modules archives (on the boot drive) that don't match our current version
+#
+# Must run after package installation because the package provides an update api config file,
+# which determines the current API version and vendor archive to keep.
+/etc/rc.d/rc.unraid-api cleanup-dependencies
+
 echo "Starting Unraid API service"
 /etc/rc.d/rc.unraid-api plugins add unraid-api-plugin-connect -b --no-restart
 /etc/rc.d/rc.unraid-api start
@@ -260,9 +312,8 @@ echo "Starting Unraid API service"
 echo "Unraid API service started"
 echo "✅ Installation is complete, it is safe to close this window"
 echo
-
 exit 0
-]]>
+      ]]>
     </INLINE>
   </FILE>