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

Makefile

@@ -0,0 +1,37 @@
+.PHONY: all build lint fmt test check clean
+
+BINARY := upaasd
+VERSION := $(shell git describe --tags --always --dirty 2>/dev/null || echo "dev")
+BUILDARCH := $(shell go env GOARCH)
+LDFLAGS := -X main.Version=$(VERSION) -X main.Buildarch=$(BUILDARCH)
+
+all: check build
+
+build:
+	go build -ldflags "$(LDFLAGS)" -o bin/$(BINARY) ./cmd/upaasd
+
+lint:
+	golangci-lint run --config .golangci.yml ./...
+
+fmt:
+	gofmt -s -w .
+	goimports -w .
+
+test:
+	go test -v -race -cover ./...
+
+# Check runs all validation without making changes
+# Used by CI and Docker build - fails if anything is wrong
+check:
+	@echo "==> Checking formatting..."
+	@test -z "$$(gofmt -l .)" || (echo "Files not formatted:" && gofmt -l . && exit 1)
+	@echo "==> Running linter..."
+	golangci-lint run --config .golangci.yml ./...
+	@echo "==> Running tests..."
+	go test -v -race ./...
+	@echo "==> Building..."
+	go build -ldflags "$(LDFLAGS)" -o /dev/null ./cmd/upaasd
+	@echo "==> All checks passed!"
+
+clean:
+	rm -rf bin/