chore(dev): wire mana-crawler into the local dev stack

Three small config changes so the Kontext "Aus URL" flow (next commit)
is runnable from a plain `pnpm dev:mana:all`:

- package.json: include mana-crawler in the dev:mana:servers
  concurrently group, and pass DATABASE_URL=…/mana_platform so the
  Go binary doesn't try to connect to a non-existent `mana` DB (its
  hardcoded default).
- .env.development: publish MANA_CRAWLER_URL=http://localhost:3023
  (the crawler's default binary port — the macmini container is
  a 3014 override, kept only in docker-compose). Also surface
  MANA_LLM_DEFAULT_MODEL for the summariser.
- docker-compose.macmini.yml: inject MANA_CRAWLER_URL + the
  default-model env into the mana-api container so production
  can reach the internal crawler and pick the summariser model
  consistently.

No runtime code touched.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

.env.development

@@ -176,6 +176,15 @@ OLLAMA_URL=http://localhost:11434
 # the GPU LLM proxy (gpu-llm.mana.how).
 MANA_LLM_URL=https://llm.mana.how
 MANA_LLM_API_KEY=
+MANA_LLM_DEFAULT_MODEL=gemma3:4b
+
+# mana-crawler — Go service. Default binary port is 3023 (local dev);
+# the macmini docker-compose overrides to 3014 internally. Used by the
+# Kontext URL import endpoint (POST /api/v1/context/import-url) to
+# fetch and convert web pages to markdown. No public ingress —
+# apps/api reaches it via localhost in dev, via mana-crawler:3014
+# hostname in the Docker network.
+MANA_CRAWLER_URL=http://localhost:3023
 
 # ============================================
 # MAERCHENZAUBER PROJECT