fix: align all non-Ubuntu packages with Debian baseline behavior

- Arch: remove system user creation, root:root ownership, fix $startdir path in PKGBUILD
- RPM: uncomment BuildRequires, add runtime deps (openssl-libs, ca-certificates), remove system user, root:root ownership
- Alpine: remove system user creation, root:root ownership, co-locate install script with APKBUILD
- All platforms now match Debian: no system user, root:root, create dirs, copy example configs, enable service

configs/linux-patch-api.apk-install

@@ -1,28 +1,18 @@
 #!/bin/sh
 # Alpine Linux install hooks for linux-patch-api
-# Reference: debian/{preinst,postinst,prerm,postrm}
+# Matches Debian preinst/postinst behavior: no system user, root:root ownership
 # Alpine APKBUILD install script format: pre-install, post-install, pre-deinstall, post-deinstall
 
-# Pre-install: Create user/group and directories before files are laid down
+# Pre-install: Create directories before files are laid down
 pre_install() {
-    # Create system group
-    if ! getent group linux-patch-api >/dev/null; then
-        addgroup --system linux-patch-api
-    fi
-
-    # Create system user
-    if ! getent passwd linux-patch-api >/dev/null; then
-        adduser --system             --ingroup linux-patch-api             --home /var/lib/linux_patch_api             --no-create-home             --shell /sbin/nologin             --gecos "Linux Patch API Service"             --disabled-password             linux-patch-api
-    fi
-
     # Create required directories
     mkdir -p /etc/linux_patch_api/certs
     mkdir -p /var/lib/linux_patch_api
     mkdir -p /var/log/linux_patch_api
 
-    # Set proper ownership
-    chown -R linux-patch-api:linux-patch-api /var/lib/linux_patch_api
-    chown -R linux-patch-api:linux-patch-api /var/log/linux_patch_api
+    # Set proper ownership (service runs as root)
+    chown -R root:root /var/lib/linux_patch_api
+    chown -R root:root /var/log/linux_patch_api
 
     # Set secure permissions
     chmod 750 /etc/linux_patch_api
@@ -40,7 +30,7 @@ post_install() {
         if [ -f "/etc/linux_patch_api/config.yaml.example" ]; then
             cp /etc/linux_patch_api/config.yaml.example /etc/linux_patch_api/config.yaml
             chmod 640 /etc/linux_patch_api/config.yaml
-            chown linux-patch-api:linux-patch-api /etc/linux_patch_api/config.yaml
+            chown root:root /etc/linux_patch_api/config.yaml
         fi
     fi
 
@@ -48,7 +38,7 @@ post_install() {
         if [ -f "/etc/linux_patch_api/whitelist.yaml.example" ]; then
             cp /etc/linux_patch_api/whitelist.yaml.example /etc/linux_patch_api/whitelist.yaml
             chmod 640 /etc/linux_patch_api/whitelist.yaml
-            chown linux-patch-api:linux-patch-api /etc/linux_patch_api/whitelist.yaml
+            chown root:root /etc/linux_patch_api/whitelist.yaml
         fi
     fi