feat: add Print Server feed target (printserver/hikerx9)

- Target System: Print Server
- Subtarget: Hiker X9
- Profiles: Hiker X9 mini, Hiker X9 Print Server, Hiker X9 Print Server with wifi
- Move dts/image from ramips to target/linux/printserver/
- Update README for printserver/hikerx9

Co-authored-by: Cursor <cursoragent@cursor.com>

target/linux/printserver/image/hiker.mk

@@ -0,0 +1,45 @@
+# Print Server / Hiker X9 Device Profiles
+
+define Device/printserver_common
+  SOC := rt5350
+  IMAGE_SIZE := 7872k
+  DEVICE_VENDOR := Hiker
+endef
+
+# Profile 1: Hiker X9 mini
+define Device/printserver_hiker_x9_mini
+  $(call Device/printserver_common)
+  DEVICE_MODEL := Hiker X9 mini
+  SUPPORTED_DEVICES := hiker,x9-minimal hiker,x9 HIKER
+  DEVICE_PACKAGES := luci-light luci-theme-bootstrap \
+    luci-i18n-base-zh-cn
+endef
+TARGET_DEVICES += printserver_hiker_x9_mini
+
+# Profile 2: Hiker X9 Print Server
+define Device/printserver_hiker_x9_print
+  $(call Device/printserver_common)
+  DEVICE_MODEL := Hiker X9 Print Server
+  SUPPORTED_DEVICES := hiker,x9-print hiker,x9 HIKER
+  DEVICE_PACKAGES := luci-light luci-theme-bootstrap \
+    luci-i18n-base-zh-cn \
+    p910nd luci-app-p910nd luci-i18n-p910nd-zh-cn \
+    kmod-usb-core kmod-usb-ohci kmod-usb2 kmod-usb-printer
+endef
+TARGET_DEVICES += printserver_hiker_x9_print
+
+# Profile 3: Hiker X9 Print Server with wifi
+define Device/printserver_hiker_x9_full
+  $(call Device/printserver_common)
+  DEVICE_MODEL := Hiker X9 Print Server with wifi
+  SUPPORTED_DEVICES := hiker,x9-full hiker,x9 HIKER
+  DEVICE_PACKAGES := luci-light luci-theme-bootstrap \
+    luci-i18n-base-zh-cn \
+    p910nd luci-app-p910nd luci-i18n-p910nd-zh-cn \
+    kmod-usb-core kmod-usb-ohci kmod-usb2 kmod-usb-printer \
+    kmod-mac80211 kmod-rt2800-lib kmod-rt2800-mmio kmod-rt2800-soc \
+    kmod-rt2x00-lib kmod-rt2x00-mmio \
+    wpad-mbedtls iw iwinfo
+endef
+TARGET_DEVICES += printserver_hiker_x9_full
+