Refactor customer → instance package, add dock service, update provision.sh

- Rename internal/customer → internal/instance, customers table → instances
- Rename API endpoint /customers → /instances
- Add internal/instance package with clean schema (drops email, subscription ID)
- Add JSON struct tags, exclude ssh_private_key from responses
- Build out crimata-dock C service (libmicrohttpd + libsystemd)
- Update provision.sh to install full OS stack from adgundersen/os
- Add MIT License

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

internal/instance/instance.go

@@ -0,0 +1,113 @@
+package instance
+
+import (
+	"database/sql"
+	"time"
+)
+
+type Status string
+
+const (
+	StatusProvisioning Status = "provisioning"
+	StatusActive       Status = "active"
+	StatusFailed       Status = "failed"
+	StatusCancelled    Status = "cancelled"
+)
+
+type Instance struct {
+	ID               int64     `json:"id"`
+	StripeCustomerID string    `json:"stripe_customer_id"`
+	Slug             string    `json:"slug"`
+	EC2InstanceID    string    `json:"ec2_instance_id"`
+	EC2PublicIP      string    `json:"ec2_public_ip"`
+	SSHPrivateKey    string    `json:"-"`
+	Status           Status    `json:"status"`
+	CreatedAt        time.Time `json:"created_at"`
+}
+
+type Store struct {
+	db *sql.DB
+}
+
+func NewStore(db *sql.DB) *Store {
+	return &Store{db: db}
+}
+
+func (s *Store) Migrate() error {
+	_, err := s.db.Exec(`
+		CREATE TABLE IF NOT EXISTS instances (
+			id                  SERIAL PRIMARY KEY,
+			stripe_customer_id  TEXT UNIQUE NOT NULL,
+			slug                TEXT UNIQUE NOT NULL,
+			ec2_instance_id     TEXT NOT NULL DEFAULT '',
+			ec2_public_ip       TEXT NOT NULL DEFAULT '',
+			ssh_private_key     TEXT NOT NULL DEFAULT '',
+			status              TEXT NOT NULL DEFAULT 'provisioning',
+			created_at          TIMESTAMPTZ NOT NULL DEFAULT NOW()
+		)
+	`)
+	return err
+}
+
+func (s *Store) Create(inst *Instance) error {
+	return s.db.QueryRow(`
+		INSERT INTO instances (stripe_customer_id, slug, status)
+		VALUES ($1, $2, $3)
+		RETURNING id, created_at`,
+		inst.StripeCustomerID, inst.Slug, inst.Status,
+	).Scan(&inst.ID, &inst.CreatedAt)
+}
+
+func (s *Store) GetByStripeID(stripeCustomerID string) (*Instance, error) {
+	inst := &Instance{}
+	err := s.db.QueryRow(`
+		SELECT id, stripe_customer_id, slug, ec2_instance_id, ec2_public_ip,
+		       ssh_private_key, status, created_at
+		FROM instances WHERE stripe_customer_id = $1`,
+		stripeCustomerID,
+	).Scan(
+		&inst.ID, &inst.StripeCustomerID, &inst.Slug,
+		&inst.EC2InstanceID, &inst.EC2PublicIP,
+		&inst.SSHPrivateKey, &inst.Status, &inst.CreatedAt,
+	)
+	if err == sql.ErrNoRows {
+		return nil, nil
+	}
+	return inst, err
+}
+
+func (s *Store) GetBySlug(slug string) (*Instance, error) {
+	inst := &Instance{}
+	err := s.db.QueryRow(`
+		SELECT id, stripe_customer_id, slug, ec2_instance_id, ec2_public_ip,
+		       ssh_private_key, status, created_at
+		FROM instances WHERE slug = $1`,
+		slug,
+	).Scan(
+		&inst.ID, &inst.StripeCustomerID, &inst.Slug,
+		&inst.EC2InstanceID, &inst.EC2PublicIP,
+		&inst.SSHPrivateKey, &inst.Status, &inst.CreatedAt,
+	)
+	if err == sql.ErrNoRows {
+		return nil, nil
+	}
+	return inst, err
+}
+
+func (s *Store) UpdateSSHKey(id int64, privateKey string) error {
+	_, err := s.db.Exec(`UPDATE instances SET ssh_private_key = $1 WHERE id = $2`, privateKey, id)
+	return err
+}
+
+func (s *Store) UpdateEC2(id int64, instanceID, publicIP string) error {
+	_, err := s.db.Exec(
+		`UPDATE instances SET ec2_instance_id = $1, ec2_public_ip = $2 WHERE id = $3`,
+		instanceID, publicIP, id,
+	)
+	return err
+}
+
+func (s *Store) UpdateStatus(id int64, status Status) error {
+	_, err := s.db.Exec(`UPDATE instances SET status = $1 WHERE id = $2`, status, id)
+	return err
+}