feat: socle BDD (tâche 1.9 Phase 1-2) + moteur APT (tâche 2 SJ-0→3) + WIP capabilities/auth/Rust

Checkpoint multi-chantiers (arbre vert : tsc 0 erreur, 70 tests, build OK).
- tâche 1.9 Phase 1 : schéma socle (machine_state/events/reports/raw_artifacts/
  hardware/metrics + colonnes étendues) + wiring refresh/execute. Migration 0002.
- tâche 1.9 Phase 2 : machine_credentials + machine_host_keys (non destructif,
  dual-read + backfill). Migration 0003. Fix séquence journal de migration.
- tâche 2 : SJ-0 (types étendus rétro-compatibles, réducteur Docker, resolveTemplate),
  SJ-1 (update-analyze enrichi), SJ-2 (apply + diff dpkg + timeout inactivité SSH),
  SJ-3 (reboot vérifié boot_id).
- WIP parallèle inclus : /api/capabilities, auth/apiTokens/apiClients, system metrics,
  scaffold app_rust, ajustements frontend.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

server/db/migrations/meta/_journal.json

@@ -8,6 +8,27 @@
       "when": 1780599514478,
       "tag": "0000_brainy_dakota_north",
       "breakpoints": true
+    },
+    {
+      "idx": 1,
+      "version": "6",
+      "when": 1780669000000,
+      "tag": "0001_api_clients",
+      "breakpoints": true
+    },
+    {
+      "idx": 2,
+      "version": "6",
+      "when": 1780669100000,
+      "tag": "0002_reflective_lifeguard",
+      "breakpoints": true
+    },
+    {
+      "idx": 3,
+      "version": "6",
+      "when": 1780669200000,
+      "tag": "0003_magical_psylocke",
+      "breakpoints": true
     }
   ]
 }