Release 0.2.22: capital chart, Investor View, GP stakes, doc folders

Snapshot commit bringing the uncommitted phase-2 work into version control
together with four new features and the 0.2.22 version bump.

New features:
- Investor capital-over-time chart (value, paid-in, distributions per
  quarter), rendered from existing capital-account history.
- Admin Investor View: read-only reconstruction of an investor's portal
  (GET /api/users/{id}/investor-view), reusing the investor portal UI.
- Document upload scoped to the selected fund's own investors, with an
  explicit upload-target confirmation to prevent mis-attaching.
- GP/mgmt entities gain an Assets tab listing their stakes in the funds
  they manage (new entity_stakes table + /api/entities/{id}/stakes).
- Edit-entity form (change type/status/etc.), so GP entities can be
  categorized correctly.

Verified: 11/11 backend tests pass; alembic upgrades to head b8c9d0e1f2a3;
frontend tsc + vite build clean; s9pk packs at 0.2.22:0 (x86_64).
Also: ignore .DS_Store and *.s9pk artifacts.

backend/alembic/versions/f6a7b8c9d0e1_service_admin.py

@@ -0,0 +1,34 @@
+"""add users.is_service_admin and flag the bootstrap admin
+
+Revision ID: f6a7b8c9d0e1
+Revises: e5f6a7b8c9d0
+Create Date: 2026-06-29 09:00:00.000000
+
+"""
+from typing import Sequence, Union
+
+from alembic import op
+import sqlalchemy as sa
+
+
+revision: str = 'f6a7b8c9d0e1'
+down_revision: Union[str, None] = 'e5f6a7b8c9d0'
+branch_labels: Union[str, Sequence[str], None] = None
+depends_on: Union[str, Sequence[str], None] = None
+
+
+def upgrade() -> None:
+    with op.batch_alter_table('users', schema=None) as batch_op:
+        batch_op.add_column(
+            sa.Column('is_service_admin', sa.Boolean(), nullable=False, server_default=sa.false())
+        )
+    # The first account created (the first-boot bootstrap admin) is the Service Admin.
+    op.execute(
+        "UPDATE users SET is_service_admin = 1 "
+        "WHERE id = (SELECT MIN(id) FROM users)"
+    )
+
+
+def downgrade() -> None:
+    with op.batch_alter_table('users', schema=None) as batch_op:
+        batch_op.drop_column('is_service_admin')