feat: add custom Gitea landing page and re-enable public access

- Disable REQUIRE_SIGNIN_VIEW to allow public landing page
- Mount custom templates directory
- Add custom home.tmpl with simple welcome page and sign-in button
- Remove default Gitea promotional content

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

dev/compose.yaml

@@ -14,6 +14,7 @@ services:
       - /etc/timezone:/etc/timezone:ro
       - /etc/localtime:/etc/localtime:ro
       - ./public:/data/gitea/public:ro
+      - ./templates:/data/gitea/templates:ro
     environment:
       TZ: ${TIMEZONE:-Europe/Berlin}
       USER_UID: 1000
@@ -37,7 +38,7 @@ services:
       GITEA__mailer__SMTP_PORT: 1025
       GITEA__mailer__FROM: ${EMAIL_FROM}
       GITEA__service__DISABLE_REGISTRATION: false
-      GITEA__service__REQUIRE_SIGNIN_VIEW: true
+      GITEA__service__REQUIRE_SIGNIN_VIEW: false
       GITEA__packages__ENABLED: true
       GITEA__actions__ENABLED: true
       GITEA__ui__THEMES: gitea-auto,gitea-light,gitea-dark,arc-green,edge-auto,edge-dark,edge-light,everforest-auto,everforest-dark,everforest-light,gruvbox-auto,gruvbox-dark,gruvbox-light,gruvbox-material-auto,gruvbox-material-dark,gruvbox-material-light,nord,palenight,soft-era,sonokai,sonokai-andromeda,sonokai-atlantis,sonokai-espresso,sonokai-maia,sonokai-shusia

dev/templates/home.tmpl

@@ -0,0 +1,32 @@
+{{template "base/head" .}}
+<div role="main" aria-label="{{if .IsSigned}}{{ctx.Locale.Tr "dashboard"}}{{else}}{{ctx.Locale.Tr "home"}}{{end}}" class="page-content home">
+	<div class="tw-mb-8 tw-px-8">
+		<div class="center">
+			<img class="logo" width="220" height="220" src="{{AssetUrlPrefix}}/img/logo.svg" alt="{{ctx.Locale.Tr "logo"}}">
+			<div class="hero">
+				<h1 class="ui icon header title tw-text-balance">
+					{{AppName}}
+				</h1>
+				<h2 class="tw-text-balance">Git with a cup of tea</h2>
+			</div>
+		</div>
+	</div>
+	<div class="ui stackable middle very relaxed page grid">
+		<div class="sixteen wide center column">
+			<h1 class="hero ui icon header">
+				{{svg "octicon-mark-github"}} Welcome to Pivoine Git
+			</h1>
+			<p class="large tw-text-balance">
+				A painless self-hosted Git service for development and collaboration.
+			</p>
+			{{if not .IsSigned}}
+			<div class="tw-mt-8">
+				<a class="ui primary button" href="{{AppSubUrl}}/user/login">
+					{{svg "octicon-sign-in"}} Sign In
+				</a>
+			</div>
+			{{end}}
+		</div>
+	</div>
+</div>
+{{template "base/footer" .}}