feat: direct docker-compose import into projects

POST /projects/:id/import-compose deploys a compose file straight into a
project — no template row required. Well-known DB images become managed
databases attached to the project network under their service name as DNS
alias; other services deploy in dependency order via deployTemplateGraph.

- api: extract composeToSpecs converter (shared by the template
  import-compose preview and the new project endpoint); fix dropped env
  warnings (pointer receiver); replace insertion sort with sort.Strings
- cascade: database_services.project_id links graph-provisioned DBs to
  their project so project delete tears down runtime + row (previously
  leaked container + network)
- cli: new `containr import` group, `import compose <project> <file|->`
- mcp: containr_projects_import_compose tool
- openapi + regenerated frontend types; docs snapshot + CLI.md
- frontend: compose import modal on the project workspace toolbar
- tests: composeToSpecs conversion, ordering, db-image map, warnings

app/backend/internal/api/databases.go

@@ -23,6 +23,8 @@ import (
 	"strings"
 	"time"
 
+	"github.com/google/uuid"
+
 	dockercontainer "github.com/docker/docker/api/types/container"
 	"github.com/docker/docker/api/types/mount"
 	"github.com/docker/docker/api/types/network"
@@ -378,6 +380,13 @@ func (h *DatabaseHandler) createManagedDatabase(ctx context.Context, userID stri
 	now := time.Now()
 	version := h.getDefaultVersion(dbType)
 
+	var projectID uuid.NullUUID
+	if req.ProjectID != "" {
+		if parsed, parseErr := uuid.Parse(req.ProjectID); parseErr == nil {
+			projectID = uuid.NullUUID{UUID: parsed, Valid: true}
+		}
+	}
+
 	err = h.queries.CreateDatabaseService(ctx, sqlcdb.CreateDatabaseServiceParams{
 		ID:         databaseID,
 		UserID:     userID,
@@ -388,6 +397,7 @@ func (h *DatabaseHandler) createManagedDatabase(ctx context.Context, userID stri
 		Plan:       plan,
 		Region:     region,
 		PublicPort: req.PublicPort,
+		ProjectID:  projectID,
 		CreatedAt:  sql.NullTime{Time: now, Valid: true},
 		UpdatedAt:  sql.NullTime{Time: now, Valid: true},
 	})