0.2.24: household-aware GP asset balances + show on Overview

Fixes a linked GP entity showing an empty Assets tab when its capital is
held under the linked account's other legal names (the eNAV often splits
one LLC across names).

- New GET /api/entities/{id}/asset-balances: household-aware, returns the
  linked account's (and its linked names') capital balances per fund, plus
  the linked account name for a clear empty state.
- Assets tab uses it; shows "linked to X but no balances on file" instead
  of a blank table when the wrong account is linked.
- GP/mgmt Overview now surfaces the total linked balance across funds with
  a "View by fund" link, so assets are visible without opening the tab.

Verified: 15/15 backend tests (incl. household case); frontend tsc + vite
build clean.

backend/ten31portal/schemas.py

@@ -350,6 +350,13 @@ class InvestorViewResponse(BaseModel):
     documents: list[DocumentResponse] = []
 
 
+class AssetBalancesResponse(BaseModel):
+    """A GP/mgmt entity's assets: the linked account's capital balances across the funds."""
+    linked_user_id: int | None = None
+    linked_name: str | None = None
+    balances: list[CapitalAccountResponse] = []
+
+
 # --- Audit ---
 
 class AuditLogResponse(BaseModel):