Initial commit with server startup infrastructure

Core infrastructure:
- Uber fx dependency injection
- Chi router with middleware stack
- SQLite database with embedded migrations
- Embedded templates and static assets
- Structured logging with slog

Features implemented:
- Authentication (login, logout, session management, argon2id hashing)
- App management (create, edit, delete, list)
- Deployment pipeline (clone, build, deploy, health check)
- Webhook processing for Gitea
- Notifications (ntfy, Slack)
- Environment variables, labels, volumes per app
- SSH key generation for deploy keys

Server startup:
- Server.Run() starts HTTP server on configured port
- Server.Shutdown() for graceful shutdown
- SetupRoutes() wires all handlers with chi router

templates/app_edit.html

@@ -0,0 +1,123 @@
+{{template "base" .}}
+
+{{define "title"}}Edit {{.App.Name}} - upaas{{end}}
+
+{{define "content"}}
+{{template "nav" .}}
+
+<main class="max-w-2xl mx-auto px-4 py-8">
+    <div class="mb-6">
+        <a href="/apps/{{.App.ID}}" class="text-primary-600 hover:text-primary-800 inline-flex items-center">
+            <svg class="w-4 h-4 mr-1" fill="none" stroke="currentColor" viewBox="0 0 24 24">
+                <path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M15 19l-7-7 7-7"/>
+            </svg>
+            Back to {{.App.Name}}
+        </a>
+    </div>
+
+    <h1 class="text-2xl font-medium text-gray-900 mb-6">Edit Application</h1>
+
+    <div class="card p-6">
+        {{template "alert-error" .}}
+
+        <form method="POST" action="/apps/{{.App.ID}}" class="space-y-6">
+            <div class="form-group">
+                <label for="name" class="label">App Name</label>
+                <input
+                    type="text"
+                    id="name"
+                    name="name"
+                    value="{{.App.Name}}"
+                    required
+                    pattern="[a-z0-9-]+"
+                    class="input"
+                >
+                <p class="text-sm text-gray-500 mt-1">Lowercase letters, numbers, and hyphens only</p>
+            </div>
+
+            <div class="form-group">
+                <label for="repo_url" class="label">Repository URL (SSH)</label>
+                <input
+                    type="text"
+                    id="repo_url"
+                    name="repo_url"
+                    value="{{.App.RepoURL}}"
+                    required
+                    class="input font-mono"
+                >
+            </div>
+
+            <div class="grid grid-cols-2 gap-4">
+                <div class="form-group">
+                    <label for="branch" class="label">Branch</label>
+                    <input
+                        type="text"
+                        id="branch"
+                        name="branch"
+                        value="{{.App.Branch}}"
+                        required
+                        class="input"
+                    >
+                </div>
+
+                <div class="form-group">
+                    <label for="dockerfile_path" class="label">Dockerfile Path</label>
+                    <input
+                        type="text"
+                        id="dockerfile_path"
+                        name="dockerfile_path"
+                        value="{{.App.DockerfilePath}}"
+                        required
+                        class="input"
+                    >
+                </div>
+            </div>
+
+            <hr class="border-gray-200">
+
+            <h3 class="text-lg font-medium text-gray-900">Optional Settings</h3>
+
+            <div class="form-group">
+                <label for="docker_network" class="label">Docker Network</label>
+                <input
+                    type="text"
+                    id="docker_network"
+                    name="docker_network"
+                    value="{{if .App.DockerNetwork.Valid}}{{.App.DockerNetwork.String}}{{end}}"
+                    class="input"
+                    placeholder="bridge"
+                >
+            </div>
+
+            <div class="form-group">
+                <label for="ntfy_topic" class="label">Ntfy Topic URL</label>
+                <input
+                    type="url"
+                    id="ntfy_topic"
+                    name="ntfy_topic"
+                    value="{{if .App.NtfyTopic.Valid}}{{.App.NtfyTopic.String}}{{end}}"
+                    class="input"
+                    placeholder="https://ntfy.sh/my-topic"
+                >
+            </div>
+
+            <div class="form-group">
+                <label for="slack_webhook" class="label">Slack Webhook URL</label>
+                <input
+                    type="url"
+                    id="slack_webhook"
+                    name="slack_webhook"
+                    value="{{if .App.SlackWebhook.Valid}}{{.App.SlackWebhook.String}}{{end}}"
+                    class="input"
+                    placeholder="https://hooks.slack.com/services/..."
+                >
+            </div>
+
+            <div class="flex justify-end gap-3 pt-4">
+                <a href="/apps/{{.App.ID}}" class="btn-secondary">Cancel</a>
+                <button type="submit" class="btn-primary">Save Changes</button>
+            </div>
+        </form>
+    </div>
+</main>
+{{end}}