feat(branding): replace all Gitea logos with Moko Consulting branding

Replace default Gitea logo.svg/logo.png with Moko Consulting logo:
- Home/login page (large logo)
- Navbar (top-left icon)
- OpenID sign-in page
- OpenGraph meta image
- 500 error page

Logo URL: https://mokoconsulting.tech/images/branding/logo.png

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

templates/base/head_navbar.tmpl

@@ -2,7 +2,7 @@
 	<div class="navbar-left">
 		<!-- the logo -->
 		<a class="item" id="navbar-logo" href="{{AppSubUrl}}/" aria-label="{{if .IsSigned}}{{ctx.Locale.Tr "dashboard"}}{{else}}{{ctx.Locale.Tr "home_title"}}{{end}}">
-			<img width="30" height="30" src="{{AssetUrlPrefix}}/img/logo.svg" alt="{{ctx.Locale.Tr "logo"}}" aria-hidden="true">
+			<img width="30" height="30" src="https://mokoconsulting.tech/images/branding/logo.png" alt="{{ctx.Locale.Tr "logo"}}" aria-hidden="true">
 		</a>
 
 		<!-- mobile right menu, it must be here because in mobile view, each item is a flex column, the first item is a full row column -->

templates/base/head_opengraph.tmpl

@@ -39,7 +39,7 @@
 {{else}}
 	<meta property="og:title" content="{{AppName}}">
 	<meta property="og:type" content="website">
-	<meta property="og:image" content="{{AssetUrlPrefix}}/img/logo.png">
+	<meta property="og:image" content="https://mokoconsulting.tech/images/branding/logo.png">
 	<meta property="og:url" content="{{ctx.AppFullLink}}">
 	<meta property="og:description" content="{{MetaDescription}}">
 {{end}}

templates/status/500.tmpl

@@ -21,7 +21,7 @@
 			<div class="ui container tw-flex">
 				<div class="item tw-flex-1">
 					<a href="{{AppSubUrl}}/" aria-label="{{ctx.Locale.Tr "home_title"}}">
-						<img width="30" height="30" src="{{AssetUrlPrefix}}/img/logo.svg" alt="{{ctx.Locale.Tr "logo"}}" aria-hidden="true">
+						<img width="30" height="30" src="https://mokoconsulting.tech/images/branding/logo.png" alt="{{ctx.Locale.Tr "logo"}}" aria-hidden="true">
 					</a>
 				</div>
 				<div class="item">

templates/user/auth/signin_openid.tmpl

@@ -3,7 +3,7 @@
 	<div class="ui middle very relaxed page grid">
 		<div class="column tw-flex tw-flex-col tw-gap-4 tw-max-w-2xl tw-m-auto">
 			<a href="{{AppSubUrl}}/user/login" class="tw-mx-auto">
-				<img width="100" height="100" src="{{AssetUrlPrefix}}/img/logo.svg" alt="{{ctx.Locale.Tr "logo"}}">
+				<img width="100" height="100" src="https://mokoconsulting.tech/images/branding/logo.png" alt="{{ctx.Locale.Tr "logo"}}">
 			</a>
 
 			<div class="ui container fluid">