Add Gitea OTA firmware update, dual-slot partition layout, and Gitea Actions release workflow

main/Kconfig.projbuild

@@ -12,4 +12,28 @@ menu "MTG RFID Companion"
         bool "Prefetch card data for all mapped UIDs at boot"
         default y
 
+    config MTG_GITEA_URL
+        string "Gitea instance base URL (e.g. https://gitea.com)"
+        default "https://gitea.com"
+        help
+            Base HTTPS URL of the Gitea instance hosting releases.
+
+    config MTG_GITEA_REPO_OWNER
+        string "Gitea repository owner / org"
+        default "user"
+        help
+            Repository owner or organization name.
+
+    config MTG_GITEA_REPO_NAME
+        string "Gitea repository name"
+        default "espMTG"
+        help
+            Repository name.
+
+    config MTG_OTA_AUTO_CHECK
+        bool "Automatically check for updates on startup"
+        default y
+        help
+            When connected to Wi-Fi, query Gitea for new releases shortly after boot.
+
 endmenu