Add zip upload and mapped-path picker for outline import

Sandbox source paths under a configured Imports:RootPath, browse it
from the web dialog, upload a zip that extracts into staging, and
import a single markdown file (agent infers chapter vs character).

deploy/qa/docker-compose.qa.yml

@@ -15,6 +15,7 @@ services:
       ANTHROPIC_API_KEY: ${ANTHROPIC_API_KEY:-}
       Agent__Model: claude-sonnet-5
       Agent__Effort: high
+      Imports__RootPath: /data/imports
     volumes:
       - /mnt/storage/apps/novelly/data:/data
     networks: