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/cli/commands/import.go

@@ -0,0 +1,57 @@
+package commands
+
+import (
+	"fmt"
+	"io"
+	"os"
+
+	"github.com/spf13/cobra"
+)
+
+var importVars []string
+
+var ImportCmd = &cobra.Command{
+	Use:   "import",
+	Short: "Import external definitions into Containr",
+}
+
+var importComposeCmd = &cobra.Command{
+	Use:   "compose <project-id> <compose.yml|->",
+	Short: "Deploy a docker-compose file straight into a project (no template)",
+	Args:  cobra.ExactArgs(2),
+	RunE: func(cmd *cobra.Command, args []string) error {
+		var raw []byte
+		var err error
+		if args[1] == "-" {
+			raw, err = io.ReadAll(os.Stdin)
+		} else {
+			raw, err = os.ReadFile(args[1])
+		}
+		if err != nil {
+			return fmt.Errorf("cannot read compose file: %w", err)
+		}
+		vars, err := parseKVFlags(importVars)
+		if err != nil {
+			return err
+		}
+		c, err := client()
+		if err != nil {
+			return err
+		}
+		body := map[string]interface{}{"compose_yaml": string(raw)}
+		if len(vars) > 0 {
+			body["variables"] = vars
+		}
+		data, err := c.Do("POST", "/projects/"+args[0]+"/import-compose", body)
+		if err != nil {
+			return err
+		}
+		PrintRaw(data)
+		return nil
+	},
+}
+
+func init() {
+	importComposeCmd.Flags().StringArrayVar(&importVars, "var", nil, "Variable override (KEY=VALUE, repeatable)")
+	ImportCmd.AddCommand(importComposeCmd)
+}

app/backend/internal/cli/root.go

@@ -79,6 +79,7 @@ func init() {
 	rootCmd.AddCommand(commands.DatabasesCmd)
 	rootCmd.AddCommand(commands.CronCmd)
 	rootCmd.AddCommand(commands.TemplatesCmd)
+	rootCmd.AddCommand(commands.ImportCmd)
 	rootCmd.AddCommand(commands.NodesCmd)
 	rootCmd.AddCommand(commands.ScalingCmd)
 	rootCmd.AddCommand(commands.HACmd)