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

docs/api/openapi.yaml

@@ -2149,6 +2149,72 @@ paths:
                         deployment_id:
                           type: string
 
+  /projects/{id}/import-compose:
+    post:
+      tags:
+        - Projects
+      summary: Deploy a docker-compose file into a project
+      description: |
+        Parses a docker-compose YAML document and deploys it directly into
+        the project — no template row. Well-known database images
+        (postgres, mysql, redis, mongo, mariadb, clickhouse, dragonfly)
+        become managed databases attached to the project network under
+        their service name as DNS alias; other services are created and
+        deployed in dependency order. Returns the created resources plus
+        any import warnings (unsupported keys, missing values).
+      security:
+        - bearerAuth: []
+      parameters:
+        - name: id
+          in: path
+          required: true
+          schema:
+            type: string
+      requestBody:
+        required: true
+        content:
+          application/json:
+            schema:
+              type: object
+              required:
+                - compose_yaml
+              properties:
+                compose_yaml:
+                  type: string
+                  description: Full docker-compose YAML document (max 512 KiB)
+                variables:
+                  type: object
+                  additionalProperties:
+                    type: string
+                plan:
+                  type: string
+                region:
+                  type: string
+      responses:
+        '201':
+          description: Stack deployed
+          content:
+            application/json:
+              schema:
+                type: object
+                properties:
+                  resource:
+                    type: string
+                  created:
+                    type: array
+                    items:
+                      type: object
+                  warnings:
+                    type: array
+                    items:
+                      type: string
+        '400':
+          description: Invalid compose YAML or unresolved references
+        '403':
+          description: Access denied
+        '404':
+          description: Project not found
+
   # Agent Onboarding Tokens
   /agent-tokens:
     post: