docs: update project documentation and verification strategies

- Update GEMINI.md with verification steps and remove ignored docs reference
- Update README.md to remove reference to local langchain-docs
- Update backend/GEMINI.md with correct database schema (users table) and architecture details
- Update frontend/GEMINI.md with latest project structure

frontend/GEMINI.md

@@ -15,11 +15,13 @@ This document serves as a guide for the frontend implementation of the Election
 ## Project Structure
 - `src/components/`:
   - `auth/`: Login, Registration, and OIDC callback forms/pages.
+  - `chat/`: Core chat interface components, including message list and plot rendering.
   - `layout/`: Main application layout including the sidebar navigation.
   - `ui/`: Reusable primitive components (buttons, cards, inputs, etc.) via Shadcn.
 - `src/services/`:
   - `api.ts`: Axios instance configuration with `/api/v1` base URL and interceptors.
   - `auth.ts`: Authentication logic (Login, Logout, OIDC, User Profile).
+  - `chat.ts`: Service for interacting with the agent streaming endpoint.
 - `src/lib/`:
   - `validations/`: Zod schemas for form validation.
   - `utils.ts`: Core utility functions.
@@ -42,3 +44,7 @@ The frontend communicates with the backend's `/api/v1` endpoints:
 - `npm run dev`: Start development server.
 - `npm run build`: Build for production.
 - `npm run test`: Run Vitest unit tests.
+
+## Documentation
+- **[README](../README.md)**: Main project documentation and setup guide.
+- **[Backend Guide](../backend/GEMINI.md)**: Backend implementation details.