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.

frontend/public/manifest.webmanifest

@@ -0,0 +1,16 @@
+{
+  "name": "Ten31 Portal",
+  "short_name": "Ten31",
+  "description": "Ten31 fund portal — entities, valuations, and investor capital accounts.",
+  "start_url": "/",
+  "scope": "/",
+  "display": "standalone",
+  "orientation": "portrait-primary",
+  "background_color": "#16243A",
+  "theme_color": "#16243A",
+  "icons": [
+    { "src": "/icon-192.png", "sizes": "192x192", "type": "image/png", "purpose": "any" },
+    { "src": "/icon-512.png", "sizes": "512x512", "type": "image/png", "purpose": "any" },
+    { "src": "/icon-512.png", "sizes": "512x512", "type": "image/png", "purpose": "maskable" }
+  ]
+}

frontend/public/sw.js

@@ -0,0 +1,56 @@
+// Ten31 Portal service worker. Deliberately conservative so it never serves a stale app:
+// - navigations are network-first (always get the latest index.html), cache only as offline fallback
+// - content-hashed /assets/* are cache-first (immutable, safe forever)
+// - /api/* is never cached
+// Bump CACHE on each release so old entries are purged.
+const CACHE = 'ten31-portal-0.2.22'
+
+self.addEventListener('install', () => self.skipWaiting())
+
+self.addEventListener('activate', (event) => {
+  event.waitUntil(
+    (async () => {
+      const keys = await caches.keys()
+      await Promise.all(keys.filter((k) => k !== CACHE).map((k) => caches.delete(k)))
+      await self.clients.claim()
+    })(),
+  )
+})
+
+self.addEventListener('fetch', (event) => {
+  const req = event.request
+  if (req.method !== 'GET') return
+  const url = new URL(req.url)
+  if (url.origin !== self.location.origin) return
+  if (url.pathname.startsWith('/api/')) return
+
+  if (req.mode === 'navigate') {
+    event.respondWith(
+      (async () => {
+        try {
+          const fresh = await fetch(req)
+          const cache = await caches.open(CACHE)
+          cache.put('/', fresh.clone())
+          return fresh
+        } catch {
+          const cache = await caches.open(CACHE)
+          return (await cache.match('/')) || Response.error()
+        }
+      })(),
+    )
+    return
+  }
+
+  if (url.pathname.startsWith('/assets/')) {
+    event.respondWith(
+      (async () => {
+        const cache = await caches.open(CACHE)
+        const hit = await cache.match(req)
+        if (hit) return hit
+        const res = await fetch(req)
+        if (res.ok) cache.put(req, res.clone())
+        return res
+      })(),
+    )
+  }
+})