Consolidate backend: drop vendored APwhy, converge on goose + sqlc

Phase 0 cleanup verified end-to-end:

- Delete vendored APwhy runtime (cmd/apwhy, internal/apwhy) and the
  unwired copy (internal/api/server.go + static bundle + cloned
  internal/{storage,analytics,auth,rbac}) — ~7.5k lines of dead code.
- Keep Containr's native internal/gateway; move APwhy management
  routes under /api/v1/gateway/* so they stop colliding with the
  native /services paths. Fix handlers against the real schema:
  UUID ids via RETURNING, integer enabled flags, plan validation,
  service validate endpoint, unique-violation mapping.
- Port agents.go off GORM onto sqlc (sqlc/queries/agents.sql);
  drop gorm dependencies; fix sqlc schema drift (services.environment_id).
- Replace the SELECT 1 goose baseline with the real consolidated
  schema (52 tables) minus APwhy's parallel auth/RBAC objects;
  idempotent via IF NOT EXISTS / OR REPLACE / guarded DO blocks so it
  replays cleanly over legacy installs. Add a drop migration for the
  dead objects and delete the legacy filename-tracked migrations/
  loader, directory, and Dockerfile copy. Verified via cmd/migrate:
  fresh install 53 tables, legacy upgrade clean to 20260917000000.
- Canvas: add invisible React Flow handles to ServiceNode so inferred
  auto-connections stop emitting warning #008.
- Remove reactflow dep (superseded by @xyflow/react), test harness
  cmds, and legacy 0001_init.sql backups.

Authored By: TDvorak <[email protected]>

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

@@ -1,6 +1,6 @@
 // Code generated by sqlc. DO NOT EDIT.
 // versions:
-//   sqlc v1.27.0
+//   sqlc v1.31.1
 
 package sqlcdb
 
@@ -11,16 +11,26 @@ import (
 )
 
 type Querier interface {
+	CompleteCommand(ctx context.Context, arg CompleteCommandParams) (AgentCommand, error)
 	CountDatabaseServicesByUserAndName(ctx context.Context, arg CountDatabaseServicesByUserAndNameParams) (int64, error)
 	CountProjectsByUser(ctx context.Context, arg CountProjectsByUserParams) (int64, error)
 	CountServicesByProjectAndName(ctx context.Context, arg CountServicesByProjectAndNameParams) (int64, error)
+	CreateAgent(ctx context.Context, arg CreateAgentParams) (NodeAgent, error)
+	CreateCommand(ctx context.Context, arg CreateCommandParams) (AgentCommand, error)
+	CreateContainer(ctx context.Context, arg CreateContainerParams) (ContainerInstance, error)
 	CreateDatabaseBackup(ctx context.Context, arg CreateDatabaseBackupParams) error
 	CreateDatabaseService(ctx context.Context, arg CreateDatabaseServiceParams) error
 	CreateProject(ctx context.Context, arg CreateProjectParams) (Project, error)
 	CreateServiceFromTemplate(ctx context.Context, arg CreateServiceFromTemplateParams) error
 	DatabaseServiceExistsByIDAndUser(ctx context.Context, arg DatabaseServiceExistsByIDAndUserParams) (bool, error)
+	DeleteAgent(ctx context.Context, id string) error
 	DeleteDatabaseServiceByIDAndUser(ctx context.Context, arg DeleteDatabaseServiceByIDAndUserParams) error
 	DeleteProjectByID(ctx context.Context, projectID uuid.UUID) (int64, error)
+	GetAgent(ctx context.Context, id string) (NodeAgent, error)
+	GetAgentByHostAndIP(ctx context.Context, arg GetAgentByHostAndIPParams) (NodeAgent, error)
+	GetCommandForAgent(ctx context.Context, arg GetCommandForAgentParams) (AgentCommand, error)
+	GetContainer(ctx context.Context, id string) (ContainerInstance, error)
+	GetContainerForAgent(ctx context.Context, arg GetContainerForAgentParams) (ContainerInstance, error)
 	GetDatabaseBackupByIDAndDatabaseAndUser(ctx context.Context, arg GetDatabaseBackupByIDAndDatabaseAndUserParams) (DatabaseBackup, error)
 	GetDatabaseServiceByIDAndUser(ctx context.Context, arg GetDatabaseServiceByIDAndUserParams) (GetDatabaseServiceByIDAndUserRow, error)
 	GetProjectByIDForUser(ctx context.Context, arg GetProjectByIDForUserParams) (Project, error)
@@ -28,9 +38,15 @@ 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)
+	InsertAgentHeartbeat(ctx context.Context, arg InsertAgentHeartbeatParams) error
 	InsertProjectEnvironment(ctx context.Context, arg InsertProjectEnvironmentParams) error
+	ListAgentHeartbeatsSince(ctx context.Context, arg ListAgentHeartbeatsSinceParams) ([]AgentHeartbeat, error)
+	ListAgents(ctx context.Context) ([]NodeAgent, error)
+	ListCommandsForAgent(ctx context.Context, nodeAgentID string) ([]AgentCommand, error)
+	ListContainersForAgent(ctx context.Context, nodeAgentID string) ([]ContainerInstance, error)
 	ListDatabaseBackupsByDatabaseAndUser(ctx context.Context, arg ListDatabaseBackupsByDatabaseAndUserParams) ([]DatabaseBackup, error)
 	ListDatabaseServicesByUser(ctx context.Context, userID string) ([]ListDatabaseServicesByUserRow, error)
+	ListPendingCommands(ctx context.Context, nodeAgentID string) ([]AgentCommand, error)
 	ListProjectsWithStatsByUser(ctx context.Context, arg ListProjectsWithStatsByUserParams) ([]ListProjectsWithStatsByUserRow, error)
 	ListServiceTemplates(ctx context.Context) ([]ServiceTemplate, error)
 	ListServiceTemplatesByCategory(ctx context.Context, category string) ([]ServiceTemplate, error)
@@ -38,6 +54,9 @@ type Querier interface {
 	SetDatabaseServiceStatusAndConnectionByID(ctx context.Context, arg SetDatabaseServiceStatusAndConnectionByIDParams) error
 	SetDatabaseServiceStatusByID(ctx context.Context, arg SetDatabaseServiceStatusByIDParams) error
 	SetDatabaseServiceStatusByIDAndUser(ctx context.Context, arg SetDatabaseServiceStatusByIDAndUserParams) error
+	UpdateAgent(ctx context.Context, arg UpdateAgentParams) (NodeAgent, error)
+	UpdateAgentHeartbeat(ctx context.Context, arg UpdateAgentHeartbeatParams) error
+	UpdateContainerStatus(ctx context.Context, arg UpdateContainerStatusParams) error
 	UpdateDatabaseServiceNameAndPlanByIDAndUser(ctx context.Context, arg UpdateDatabaseServiceNameAndPlanByIDAndUserParams) error
 	UpdateDatabaseServiceNameByIDAndUser(ctx context.Context, arg UpdateDatabaseServiceNameByIDAndUserParams) error
 	UpdateDatabaseServicePlanByIDAndUser(ctx context.Context, arg UpdateDatabaseServicePlanByIDAndUserParams) error