Implement adjudicated DO items across backend, frontend, deploy

From the ROADMAP adjudication (12 of 13 DO items; D2 is a commit action).

Backend:
- B3: pytest suite (auth, entity CRUD, rollup) + dev deps + pytest config
- B4: cap document uploads at TEN31_MAX_UPLOAD_SIZE (default 50MB), stream-
  checked with partial-file cleanup, 413 on overflow
- B7: type AuditLog.detail as dict|list|str|None to match the JSON column
- B10: index foreign-key columns (migration a7b8c9d0e1f2 + index=True)
- B11: cli delete-user logs file-removal errors instead of swallowing them

Frontend:
- F2: distinguish "server unreachable" from "logged out"; retry prompt
- F4: confirm before destructive holdings-replace on import; step progress
- F6: expandable audit-log detail with full JSON
- F7: empty-state on the Investments page
- F8: shared role helpers (WRITER_ROLES/canEditRound/isApprover), used by
  EntitiesList, AuditLog, Import, ValuationWorkflow

Deploy:
- D5: run tsc --noEmit before packaging (build script)
- D6: TEN31_LOG_LEVEL env var (defaults to info)

Verified: 8/8 backend tests pass; alembic upgrades to head with 13 FK
indexes; upload limit rejects oversized + cleans up; frontend tsc + vite
build clean; dev server serves and proxies to the API.

deploy/start.sh

@@ -18,21 +18,27 @@ if [ ! -f /data/.initialized ]; then
 
   # Set default credentials (user can change via CLI later)
   ADMIN_NAME="${TEN31_ADMIN_NAME:-Jonathan}"
+  ADMIN_USERNAME="${TEN31_ADMIN_USERNAME:-admin}"
   ADMIN_EMAIL="${TEN31_ADMIN_EMAIL:-jonathan@ten31.xyz}"
   ADMIN_PASSWORD="${TEN31_ADMIN_PASSWORD:-Ten31}"
 
   python3 -m ten31portal.cli create-user \
     --name "$ADMIN_NAME" \
+    --username "$ADMIN_USERNAME" \
     --email "$ADMIN_EMAIL" \
     --role approver \
-    --password "$ADMIN_PASSWORD" || true
+    --password "$ADMIN_PASSWORD" \
+    --service-admin || true
 
   touch /data/.initialized
-  echo "Default approver created: $ADMIN_EMAIL"
+  echo "Default approver created: username=$ADMIN_USERNAME"
 fi
 
+# Log level is overridable at runtime for debugging; defaults to info.
+LOG_LEVEL="${TEN31_LOG_LEVEL:-info}"
+
 # Serve frontend static files from the backend
 exec uvicorn ten31portal.main:app \
   --host 0.0.0.0 \
   --port 8000 \
-  --log-level info
+  --log-level "$LOG_LEVEL"