Initial commit: LlamaLink Go rewrite

Complete rewrite from Python/FastAPI to Go/Gin:
- Go backend: auth (API keys + bcrypt), llama.cpp subprocess manager,
  hot-swap multi-model, rate limiting, quota system, webhooks
- Vue 3 SPA admin panel (src/) with Tailwind CSS
- Deployment: Docker multi-stage, docker-compose, nginx, systemd
- GORM/SQLite models: ApiKey, Model, UsageLog, Quota, Webhook
- REST API: /api/v1/admin/* (keys, models, chat, usage, health)
- Embedded frontend via go:embed (build output at web/dist/)

Removed legacy Python artifacts (app/, tests/, pyproject.toml, etc.)

Makefile

@@ -0,0 +1,104 @@
+.PHONY: build run test lint clean migrate dev prod deps fmt
+
+# Binary name
+BINARY=llamalink
+VERSION=$(shell git describe --tags --always --dirty 2>/dev/null || echo "dev")
+BUILD_TIME=$(shell date -u '+%Y-%m-%d_%H:%M:%S')
+LDFLAGS=-ldflags "-X main.Version=$(VERSION) -X main.BuildTime=$(BUILD_TIME)"
+
+# Directories
+BUILD_DIR=./bin
+FRONTEND_DIR=./web/frontend
+
+# Go parameters
+GOCMD=go
+GOBUILD=$(GOCMD) build $(LDFLAGS)
+GOTEST=$(GOCMD) test
+GOGET=$(GOCMD) get
+GOMOD=$(GOCMD) mod
+GOFMT=gofmt
+GOLINT=golangci-lint
+
+# Default target
+all: deps build
+
+## build: Build the binary
+build:
+	@echo "Building $(BINARY)..."
+	@mkdir -p $(BUILD_DIR)
+	$(GOBUILD) -o $(BUILD_DIR)/$(BINARY) ./cmd/llamalink
+
+## run: Build and run
+run: build
+	@echo "Running..."
+	$(BUILD_DIR)/$(BINARY)
+
+## dev: Run in development mode
+dev:
+	LLAMALINK_ENV=development $(GOCMD) run ./cmd/llamalink
+
+## test: Run tests
+test:
+	$(GOTEST) -v -race -coverprofile=coverage.out ./...
+
+## test/integration: Run integration tests
+test/integration:
+	$(GOTEST) -v -tags=integration ./tests/integration/...
+
+## lint: Run linters
+lint:
+	$(GOLINT) run ./...
+
+## fmt: Format code
+fmt:
+	$(GOFMT) -s -w .
+
+## deps: Download dependencies
+deps:
+	$(GOMOD) download
+	$(GOMOD) tidy
+
+## clean: Remove build artifacts
+clean:
+	rm -rf $(BUILD_DIR)
+	rm -f coverage.out
+	rm -f *.db
+
+## migrate/up: Run database migrations up
+migrate/up:
+	migrate -path internal/db/migrations -database "$(DATABASE_URL)" up
+
+## migrate/down: Run database migrations down
+migrate/down:
+	migrate -path internal/db/migrations -database "$(DATABASE_URL)" down
+
+## migrate/create: Create a new migration
+migrate/create NAME=add_users_table:
+	migrate create -path internal/db/migrations -ext .sql -dir internal/db/migrations $(NAME)
+
+## frontend/install: Install frontend dependencies
+frontend/install:
+	cd $(FRONTEND_DIR) && npm install
+
+## frontend/dev: Run frontend dev server
+frontend/dev:
+	cd $(FRONTEND_DIR) && npm run dev
+
+## frontend/build: Build frontend for production
+frontend/build:
+	cd $(FRONTEND_DIR) && npm run build
+
+## docker/build: Build Docker image
+docker/build:
+	docker build -t llamalink:latest -f deploy/Dockerfile .
+
+## docker/run: Run Docker container
+docker/run:
+	docker-compose -f deploy/docker-compose.yml up
+
+## docker/build/run: Build and run with docker-compose
+docker/build/run: docker/build docker/run
+
+## help: Show this help
+help:
+	@grep -E '^[a-zA-Z_-]+:.*?## .*$$' $(MAKEFILE_LIST) | sort | awk 'BEGIN {FS = ":.*?## "}; {printf "\033[36m%-20s\033[0m %s\n", $$1, $$2}'