Add Dalidou storage foundation and deployment prep

docs/dalidou-storage-migration.md

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+# Dalidou Storage Migration
+
+## Goal
+Establish Dalidou as the canonical AtoCore host while keeping human-readable
+source layers separate from machine operational storage.
+
+## Canonical layout
+
+```text
+/srv/atocore/
+  app/         # git checkout of this repository
+  data/        # machine operational state
+    db/
+      atocore.db
+    chroma/
+    cache/
+    tmp/
+  sources/
+    vault/     # AtoVault input, read-only by convention
+    drive/     # AtoDrive input, read-only by convention
+  logs/
+  backups/
+  run/
+  config/
+    .env
+```
+
+## Environment variables
+
+Suggested Dalidou values:
+
+```bash
+ATOCORE_ENV=production
+ATOCORE_DATA_DIR=/srv/atocore/data
+ATOCORE_DB_DIR=/srv/atocore/data/db
+ATOCORE_CHROMA_DIR=/srv/atocore/data/chroma
+ATOCORE_CACHE_DIR=/srv/atocore/data/cache
+ATOCORE_TMP_DIR=/srv/atocore/data/tmp
+ATOCORE_VAULT_SOURCE_DIR=/srv/atocore/sources/vault
+ATOCORE_DRIVE_SOURCE_DIR=/srv/atocore/sources/drive
+ATOCORE_LOG_DIR=/srv/atocore/logs
+ATOCORE_BACKUP_DIR=/srv/atocore/backups
+ATOCORE_RUN_DIR=/srv/atocore/run
+```
+
+## Migration notes
+
+- Existing local installs remain backward-compatible.
+- If `data/atocore.db` already exists, AtoCore continues using it.
+- Fresh installs default to `data/db/atocore.db`.
+- Source directories are inputs only; AtoCore should ingest from them but not
+  treat them as writable runtime state.
+- Avoid syncing live SQLite/Chroma state between Dalidou and other machines.
+  Prefer one canonical running service and API access from OpenClaw.
+
+## Deferred work
+
+- service manager wiring
+- backup/snapshot procedures
+- automated source registration jobs
+- OpenClaw integration