Content inspection and archive walks on seeding nodes (relay)

Inspection is split into prepare (database), probe (lib/content/probe:
downloads, decoding and parsing, no database) and apply (database).
worker:collection runs all three; seed:node with SEED_INSPECTORS leases
jobs from the same queues through the seed API (BullMQ manual leases),
fetches articles through the seed API and posts the probes back.

A node now needs only SEED_URL and SEED_TOKEN: the settings the app
requires but a node never uses get placeholders for seed:node.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

start/env.ts

@@ -11,6 +11,38 @@
 
 import { Env } from '@adonisjs/core/env'
 
+/**
+ * A seeding node (`node ace seed:node`, CONCEPT.md D38) has no database,
+ * Redis or web server, and in relay mode no NNTP account, but the app's
+ * configuration still reads those settings: they get placeholders here, so
+ * a node needs only SEED_URL and SEED_TOKEN. Values that are set win (e.g.
+ * the NNTP account of a node with SEED_FETCH=direct).
+ */
+if (process.env.ACE_COMMAND === 'seed:node') {
+  const placeholders: Record<string, string> = {
+    NODE_ENV: 'production',
+    PORT: '3333',
+    HOST: '0.0.0.0',
+    LOG_LEVEL: 'info',
+    APP_KEY: 'unused-on-seed-nodes-unused-on-seed-nodes',
+    APP_URL: 'http://localhost:3333',
+    SESSION_DRIVER: 'memory',
+    DB_CONNECTION: 'pg',
+    DB_HOST: 'localhost',
+    DB_PORT: '5432',
+    DB_USER: 'unused',
+    DB_DATABASE: 'unused',
+    REDIS_HOST: 'localhost',
+    REDIS_PORT: '6379',
+    NNTP_HOST: 'localhost',
+    NNTP_PORT: '563',
+    NNTP_USER: 'unused',
+    NNTP_PASSWORD: 'unused',
+    NNTP_SECURE: 'true',
+  }
+  for (const [name, value] of Object.entries(placeholders)) process.env[name] ??= value
+}
+
 export default await Env.create(new URL('../', import.meta.url), {
   // Node
   NODE_ENV: Env.schema.enum(['development', 'production', 'test'] as const),

start/routes.ts

@@ -59,6 +59,12 @@ router
     router.post('ranges/:id/done', [SeedController, 'done']).where('id', router.matchers.number())
     router.post('ranges/:id/release', [SeedController, 'release']).where('id', router.matchers.number())
     router.get('status', [SeedController, 'status'])
+    // Content inspection and archive walks on nodes (CONCEPT.md D41).
+    router.post('inspect/lease', [SeedController, 'inspectLease'])
+    router.post('inspect/done', [SeedController, 'inspectDone'])
+    router.post('inspect/failed', [SeedController, 'inspectFailed'])
+    router.post('inspect/release', [SeedController, 'inspectRelease'])
+    router.get('articles', [SeedController, 'article'])
   })
   .prefix('/api/v1/seed')
   .use(middleware.seedNode())