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

cmd/upaasd/main.go

@@ -0,0 +1,57 @@
+// Package main is the entry point for upaasd.
+package main
+
+import (
+	"go.uber.org/fx"
+
+	"git.eeqj.de/sneak/upaas/internal/config"
+	"git.eeqj.de/sneak/upaas/internal/database"
+	"git.eeqj.de/sneak/upaas/internal/docker"
+	"git.eeqj.de/sneak/upaas/internal/globals"
+	"git.eeqj.de/sneak/upaas/internal/handlers"
+	"git.eeqj.de/sneak/upaas/internal/healthcheck"
+	"git.eeqj.de/sneak/upaas/internal/logger"
+	"git.eeqj.de/sneak/upaas/internal/middleware"
+	"git.eeqj.de/sneak/upaas/internal/server"
+	"git.eeqj.de/sneak/upaas/internal/service/app"
+	"git.eeqj.de/sneak/upaas/internal/service/auth"
+	"git.eeqj.de/sneak/upaas/internal/service/deploy"
+	"git.eeqj.de/sneak/upaas/internal/service/notify"
+	"git.eeqj.de/sneak/upaas/internal/service/webhook"
+
+	_ "github.com/joho/godotenv/autoload"
+)
+
+// Build-time variables injected by linker flags (-ldflags).
+// These must be exported package-level variables for the build system.
+var (
+	Appname   = "upaas" //nolint:gochecknoglobals // build-time variable
+	Version   string    //nolint:gochecknoglobals // build-time variable
+	Buildarch string    //nolint:gochecknoglobals // build-time variable
+)
+
+func main() {
+	globals.SetAppname(Appname)
+	globals.SetVersion(Version)
+	globals.SetBuildarch(Buildarch)
+
+	fx.New(
+		fx.Provide(
+			globals.New,
+			logger.New,
+			config.New,
+			database.New,
+			healthcheck.New,
+			auth.New,
+			app.New,
+			docker.New,
+			notify.New,
+			deploy.New,
+			webhook.New,
+			middleware.New,
+			handlers.New,
+			server.New,
+		),
+		fx.Invoke(func(*server.Server) {}),
+	).Run()
+}