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/projects.go

@@ -7,6 +7,7 @@ import (
 	"context"
 	"database/sql"
 	"errors"
+	"log"
 	"net/http"
 	"strings"
 	"time"
@@ -297,6 +298,28 @@ func handleDeleteProject(c *gin.Context) {
 		return
 	}
 
+	// Managed databases provisioned into this project (graph templates,
+	// compose imports) carry project_id and must be torn down first — their
+	// containers are not labelled containr.project and hold references to the
+	// project network.
+	if dbHandlerValue, exists := c.Get("database_handler"); exists && dbHandlerValue != nil {
+		if dbHandler, ok := dbHandlerValue.(*DatabaseHandler); ok {
+			ctx, cancel := context.WithTimeout(c.Request.Context(), 30*time.Second)
+			projectDBs, listErr := dbHandler.queries.ListDatabaseServicesByProject(ctx, uuid.NullUUID{UUID: projectID, Valid: true})
+			if listErr == nil {
+				for _, projectDB := range projectDBs {
+					if projectDB.Provider != "external" {
+						if err := dbHandler.deleteManagedDatabaseRuntime(projectDB.ID); err != nil {
+							log.Printf("delete project %s: database %s runtime removal failed: %v", projectID, projectDB.ID, err)
+						}
+					}
+					_ = dbHandler.queries.DeleteDatabaseServiceByID(ctx, projectDB.ID)
+				}
+			}
+			cancel()
+		}
+	}
+
 	// Remove live containers and the project network before dropping rows.
 	// Best-effort: Docker may be unavailable; DB cleanup proceeds regardless.
 	if engineValue, exists := c.Get("deployment_engine"); exists && engineValue != nil {