hassfest: fix manifest key order, drop markdown from i18n, add CONFIG_SCHEMA

- manifest.json: keys reordered to domain, name, then alphabetical
- strings.json + translations/en.json: rephrase user-step description
  without backticks/angle-brackets (hassfest rejects HTML in i18n strings)
- __init__.py: add CONFIG_SCHEMA = cv.config_entry_only_config_schema(DOMAIN)
  since async_setup exists but the integration is config-entry-only

custom_components/omni_pca/__init__.py

@@ -13,6 +13,7 @@ from typing import TYPE_CHECKING
 
 from homeassistant.const import CONF_HOST, CONF_PORT, Platform
 from homeassistant.exceptions import ConfigEntryNotReady
+from homeassistant.helpers import config_validation as cv
 
 from .const import (
     CONF_CONTROLLER_KEY,
@@ -41,6 +42,8 @@ PLATFORMS: list[Platform] = [
     Platform.SWITCH,
 ]
 
+CONFIG_SCHEMA = cv.config_entry_only_config_schema(DOMAIN)
+
 
 async def async_setup(hass: HomeAssistant, config: dict) -> bool:
     """No YAML support; everything is config-flow driven."""

custom_components/omni_pca/manifest.json

@@ -1,13 +1,13 @@
 {
     "domain": "omni_pca",
     "name": "HAI/Leviton Omni Panel",
-    "version": "2026.5.11",
-    "iot_class": "local_push",
+    "codeowners": ["@rsp2k"],
     "config_flow": true,
     "dependencies": [],
-    "codeowners": ["@rsp2k"],
-    "requirements": ["omni-pca==2026.5.11"],
     "documentation": "https://github.com/rsp2k/omni-pca",
+    "integration_type": "hub",
+    "iot_class": "local_push",
     "issue_tracker": "https://github.com/rsp2k/omni-pca/issues",
-    "integration_type": "hub"
+    "requirements": ["omni-pca==2026.5.11"],
+    "version": "2026.5.11"
 }

custom_components/omni_pca/strings.json

@@ -3,7 +3,7 @@
         "step": {
             "user": {
                 "title": "Connect to your Omni panel",
-                "description": "Enter the IP/hostname of your HAI/Leviton Omni Pro II controller and the 32-character hex Controller Key. Use `omni-pca decode-pca <file>.pca --field controller_key` to extract the key from a PC Access export. Optionally provide a path to a saved `.pca` file to load panel programs from disk instead of streaming them from the controller.",
+                "description": "Enter the IP/hostname of your HAI/Leviton Omni Pro II controller and the 32-character hex Controller Key. Run omni-pca decode-pca with the --field controller_key option on a PC Access export file to extract the key. Optionally provide a path to a saved .pca file to load panel programs from disk instead of streaming them from the controller.",
                 "data": {
                     "host": "Host",
                     "port": "Port",

custom_components/omni_pca/translations/en.json

@@ -3,7 +3,7 @@
         "step": {
             "user": {
                 "title": "Connect to your Omni panel",
-                "description": "Enter the IP/hostname of your HAI/Leviton Omni Pro II controller and the 32-character hex Controller Key. Use `omni-pca decode-pca <file>.pca --field controller_key` to extract the key from a PC Access export. Optionally provide a path to a saved `.pca` file to load panel programs from disk instead of streaming them from the controller.",
+                "description": "Enter the IP/hostname of your HAI/Leviton Omni Pro II controller and the 32-character hex Controller Key. Run omni-pca decode-pca with the --field controller_key option on a PC Access export file to extract the key. Optionally provide a path to a saved .pca file to load panel programs from disk instead of streaming them from the controller.",
                 "data": {
                     "host": "Host",
                     "port": "Port",