Add project scaffolding with fx DI, SQLite migrations, and healthcheck

- go.mod with git.eeqj.de/sneak/chat module
- internal packages: globals, logger, config, db, healthcheck, middleware, handlers, server
- SQLite database with embedded migration system (schema_migrations tracking)
- Migration 001: schema_migrations table
- Migration 002: channels table
- Config with chat-specific vars (MAX_HISTORY, SESSION_TIMEOUT, MAX_MESSAGE_SIZE, MOTD, SERVER_NAME, FEDERATION_KEY)
- Healthcheck endpoint at /.well-known/healthcheck.json
- Makefile, .gitignore
- cmd/chatd/main.go entry point

Makefile

@@ -0,0 +1,48 @@
+FN := chat
+
+VERSION := $(shell git describe --always --dirty=-dirty)
+ARCH := $(shell uname -m)
+UNAME_S := $(shell uname -s)
+GOLDFLAGS += -X main.Version=$(VERSION)
+GOFLAGS := -ldflags "$(GOLDFLAGS)"
+
+default: clean debug
+
+commit: fmt lint
+	git commit -a
+
+fmt:
+	gofumpt -l -w .
+	golangci-lint run --fix
+
+lint:
+	golangci-lint run
+	sh -c 'test -z "$$(gofmt -l .)"'
+
+test:
+	go test ./...
+
+check: lint test
+
+debug: ./$(FN)d
+	DEBUG=1 GOTRACEBACK=all ./$(FN)d
+
+debugger:
+	cd cmd/$(FN)d && dlv debug main.go
+
+run: ./$(FN)d
+	./$(FN)d
+
+clean:
+	-rm -f ./$(FN)d debug.log
+
+docker:
+	docker build --progress plain .
+
+./$(FN)d: cmd/$(FN)d/main.go internal/*/*.go
+	cd ./cmd/$(FN)d && \
+		go build -o ../../$(FN)d $(GOFLAGS) .
+
+tools:
+	go get -v github.com/golangci/golangci-lint/cmd/golangci-lint@v1.31.0
+	go get -v mvdan.cc/gofumpt/gofumports