Rebrand to volundr; add deploy artifacts

- User-facing brand "bike-admin" -> "volundr" (page titles, top bar,
  login header, FastAPI title, README/AGENTS). Directory, remote,
  BIKE_ADMIN_* env prefix and bike_admin.db filename are unchanged.
- Add deploy/: systemd unit (bike-admin.service) and a production
  .env template (env.production.example).

app/__init__.py

@@ -1 +1 @@
-"""bike-admin package."""
+"""volundr package."""

app/main.py

@@ -215,7 +215,7 @@ async def lifespan(_: FastAPI):
     yield
 
 
-app = FastAPI(title="bike-admin", lifespan=lifespan)
+app = FastAPI(title="volundr", lifespan=lifespan)
 
 
 @app.exception_handler(FastAPIUnauthorized)

app/templates/base.html

@@ -3,14 +3,14 @@
 <head>
 <meta charset="utf-8">
 <meta name="viewport" content="width=device-width, initial-scale=1">
-<title>{% block title %}bike-admin{% endblock %}</title>
+<title>{% block title %}volundr{% endblock %}</title>
 <link rel="icon" href="/static/favicon.svg" type="image/svg+xml">
 <link rel="stylesheet" href="/static/main.css">
 <script src="/static/htmx.min.js" defer></script>
 </head>
 <body>
 <header class="topbar">
-  <a class="brand" href="/">bike-admin</a>
+  <a class="brand" href="/">volundr</a>
   <nav class="nav">
     <a href="/bikes/new" class="btn btn-primary">+ Bike</a>
     <a href="/logout"

app/templates/bikes/detail.html

@@ -1,5 +1,5 @@
 {% extends "base.html" %}
-{% block title %}{{ bike.name }} - bike-admin{% endblock %}
+{% block title %}{{ bike.name }} - volundr{% endblock %}
 {% block content %}
 <div class="page-head">
   <h1>{{ bike.name }}</h1>

app/templates/bikes/edit.html

@@ -1,5 +1,5 @@
 {% extends "base.html" %}
-{% block title %}Edit bike - bike-admin{% endblock %}
+{% block title %}Edit bike - volundr{% endblock %}
 {% block content %}
 <div class="page-head"><h1>Edit {{ bike.name }}</h1></div>
 <div class="card">

app/templates/bikes/new.html

@@ -1,5 +1,5 @@
 {% extends "base.html" %}
-{% block title %}New bike - bike-admin{% endblock %}
+{% block title %}New bike - volundr{% endblock %}
 {% block content %}
 <div class="page-head"><h1>New bike</h1></div>
 <div class="card">

app/templates/dashboard.html

@@ -1,5 +1,5 @@
 {% extends "base.html" %}
-{% block title %}Dashboard - bike-admin{% endblock %}
+{% block title %}Dashboard - volundr{% endblock %}
 {% block content %}
 <div class="page-head">
   <h1>Your bikes</h1>

app/templates/login.html

@@ -3,13 +3,13 @@
 <head>
 <meta charset="utf-8">
 <meta name="viewport" content="width=device-width, initial-scale=1">
-<title>Log in - bike-admin</title>
+<title>Log in - volundr</title>
 <link rel="icon" href="/static/favicon.svg" type="image/svg+xml">
 <link rel="stylesheet" href="/static/main.css">
 </head>
 <body class="auth">
 <main class="container auth-card">
-  <h1 style="margin-top:0">bike-admin</h1>
+  <h1 style="margin-top:0">volundr</h1>
   <p class="muted">Log in to manage your bikes.</p>
 
   {% if error %}