Add the native Hesychia Android client so the repo can build beyond the placeholder README.

docs/SCREEN_INVENTORY.md

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+# Screen inventory (mirror of llm-fe)
+
+Source: `chat_web_app/llm-fe/src/App.tsx` routes + key shells.
+
+| Web route | Native v1 | Priority | Notes |
+|-----------|-----------|----------|-------|
+| `/signin/` | SignIn | P0 | Email/password JWT (`POST token/`) |
+| `/signup/` | SignUp | P0 | After create → RevenueCat purchase (Workstream E) |
+| `/auth/callback/` | Deep link / Custom Tab return | P1 | Google / Microsoft SSO |
+| `/password_reset/` | Custom Tab + deep link | P1 | |
+| `/password_reset_confirmation/` | Deep link | P1 | |
+| `/set_password/` | Deep link | P2 | |
+| `/` (AsyncDashboard2) | Chat | P0 | Conversations list + detail + compose |
+| `/account/` | Account | P0 | Usage, theme, billing (RC), delete account |
+| `/billing/success` `/billing/cancel` | N/A on Play | — | Stripe web only |
+| `/document_storage` | Deferred | P2 | Confirm product need on mobile |
+| `/feedback/` | Deferred | P2 | |
+| `/analytics/` | Deferred / omit | P3 | Tianji subset TBD |
+| `/terms_of_service/` `/legal/terms-of-service` | Custom Tab to web | P1 | |
+| `/account-deletion/` | Custom Tab to public URL | P0 (store) | `https://hesychia.ai/account-deletion/` (#103) |
+| NotFound | System back / empty | — | |
+
+## Chat subflows (from AsyncDashboard2 / ConversationDetailCard)
+
+- Conversation list create / select / rename / delete
+- Message history load + pagination
+- Streaming tokens over WebSocket
+- Markdown / code / citations
+- Message actions (copy, regenerate, …) — product prune
+
+## Account subflows
+
+- Usage meters
+- Theme: dark mode + palette (`blue|green|purple|orange|red`)
+- Billing: subscribe / restore / manage (RevenueCat; badge `revenuecat` + `PLAY_STORE`)
+- Delete account → `DELETE /api/user/` + RC `logOut`