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.)

internal/db/seed.go

@@ -0,0 +1,42 @@
+package db
+
+import (
+	"log/slog"
+
+	"golang.org/x/crypto/bcrypt"
+	"github.com/google/uuid"
+	"gorm.io/gorm"
+)
+
+func SeedAdminKey(db *gorm.DB, adminToken string) error {
+	var count int64
+	db.Model(&ApiKey{}).Count(&count)
+
+	if count > 0 {
+		slog.Info("admin key already exists, skipping seed")
+		return nil
+	}
+
+	hash, err := bcrypt.GenerateFromPassword([]byte(adminToken), bcrypt.DefaultCost)
+	if err != nil {
+		return err
+	}
+
+	admin := ApiKey{
+		ID:        uuid.New(),
+		Name:      "admin",
+		KeyHash:   string(hash),
+		KeyPrefix: "admin-",
+		Scopes:    StringArray{"chat", "models", "usage", "admin"},
+		IsActive:  true,
+		IsAdmin:   true,
+	}
+
+	if err := db.Create(&admin).Error; err != nil {
+		return err
+	}
+
+	slog.Info("admin key seeded", "prefix", admin.KeyPrefix)
+	slog.Warn("ADMIN TOKEN: " + adminToken + " (save this!)")
+	return nil
+}