feat: personal access tokens with scoped bearer auth

Add cnp_ personal access tokens so the CLI, MCP server, and external
agents authenticate without a browser session — the agent-first spine
from ROADMAP2 phase A. Modeled on agent_auth_tokens: raw token shown
once, only SHA-256 hash stored.

- user_tokens table (goose migration + sqlc), name/prefix/scope/expiry,
  owner-scoped revoke, last_used_at stamping
- middleware: cnp_ bearer resolution, read scope gates mutations with
  403 SCOPE_INSUFFICIENT, non-admin scopes cap is_admin even for admin
  owners — a token never outranks its scope or its owner
- GET/POST/DELETE /api/v1/user/tokens + OpenAPI + generated types
- Settings UI: create with scope/expiry pickers, one-time token display
  with copy, list with last-used/expiry, confirm-revoke
- docs: OPERATIONS.md section, README feature line

Verified end-to-end against live Postgres: create/list/revoke, read
scope blocks PUT (403), write PAT on admin owner blocked from admin
routes (403), admin scope works, revoked token returns 401.

Authored By: TDvorak <[email protected]>

app/backend/internal/database/sqlcdb/querier.go

@@ -26,6 +26,7 @@ type Querier interface {
 	CreateProject(ctx context.Context, arg CreateProjectParams) (Project, error)
 	CreateServiceFromTemplate(ctx context.Context, arg CreateServiceFromTemplateParams) error
 	CreateUserTemplate(ctx context.Context, arg CreateUserTemplateParams) error
+	CreateUserToken(ctx context.Context, arg CreateUserTokenParams) (UserToken, error)
 	DatabaseServiceExistsByIDAndUser(ctx context.Context, arg DatabaseServiceExistsByIDAndUserParams) (bool, error)
 	DeleteAgent(ctx context.Context, id string) error
 	DeleteDatabaseServiceByIDAndUser(ctx context.Context, arg DeleteDatabaseServiceByIDAndUserParams) error
@@ -46,6 +47,7 @@ type Querier interface {
 	GetProjectOwnerID(ctx context.Context, id uuid.UUID) (uuid.UUID, error)
 	GetProjectRoleForUser(ctx context.Context, arg GetProjectRoleForUserParams) (string, error)
 	GetServiceTemplateByID(ctx context.Context, id string) (ServiceTemplate, error)
+	GetUserTokenByHash(ctx context.Context, tokenHash string) (UserToken, error)
 	InsertAgentHeartbeat(ctx context.Context, arg InsertAgentHeartbeatParams) error
 	InsertProjectEnvironment(ctx context.Context, arg InsertProjectEnvironmentParams) error
 	ListAgentAuthTokens(ctx context.Context) ([]AgentAuthToken, error)
@@ -66,9 +68,11 @@ type Querier interface {
 	ListProjectsWithStatsByUser(ctx context.Context, arg ListProjectsWithStatsByUserParams) ([]ListProjectsWithStatsByUserRow, error)
 	ListServiceTemplatesByCategoryForUser(ctx context.Context, arg ListServiceTemplatesByCategoryForUserParams) ([]ServiceTemplate, error)
 	ListServiceTemplatesForUser(ctx context.Context, ownerID uuid.NullUUID) ([]ServiceTemplate, error)
+	ListUserTokens(ctx context.Context, userID uuid.UUID) ([]UserToken, error)
 	MarkAllNotificationsReadByUser(ctx context.Context, arg MarkAllNotificationsReadByUserParams) error
 	MarkNotificationReadByIDAndUser(ctx context.Context, arg MarkNotificationReadByIDAndUserParams) error
 	RevokeAgentAuthToken(ctx context.Context, id uuid.UUID) (AgentAuthToken, error)
+	RevokeUserToken(ctx context.Context, arg RevokeUserTokenParams) (int64, error)
 	SetDatabaseBackupScheduleByIDAndUser(ctx context.Context, arg SetDatabaseBackupScheduleByIDAndUserParams) error
 	SetDatabaseBackupStatusByID(ctx context.Context, arg SetDatabaseBackupStatusByIDParams) error
 	SetDatabaseNextBackupAt(ctx context.Context, arg SetDatabaseNextBackupAtParams) error
@@ -77,6 +81,7 @@ type Querier interface {
 	SetDatabaseServiceStatusByIDAndUser(ctx context.Context, arg SetDatabaseServiceStatusByIDAndUserParams) error
 	SetProjectApproved(ctx context.Context, arg SetProjectApprovedParams) (int64, error)
 	TouchAgentAuthToken(ctx context.Context, tokenHash string) error
+	TouchUserToken(ctx context.Context, id uuid.UUID) error
 	UpdateAgent(ctx context.Context, arg UpdateAgentParams) (NodeAgent, error)
 	UpdateAgentHeartbeat(ctx context.Context, arg UpdateAgentHeartbeatParams) error
 	UpdateContainerStatus(ctx context.Context, arg UpdateContainerStatusParams) error