Add responses proxies and usage fixes

AGENTS.md

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+# Repository Guidelines
+
+## Project Structure & Module Organization
+- `src/`: Cloudflare Workers backend (Hono + chanfana). Key areas:
+  - `src/providers/`: provider proxies (OpenAI, Azure OpenAI, Claude, Responses).
+  - `src/admin/`: admin APIs (channels, tokens, pricing, DB init).
+  - `src/db/`: D1 schema/init helpers.
+- `public/`: built admin UI assets served by Workers.
+- `frontend/`: React/Vite admin UI source (build outputs to `public/`).
+- `wrangler.toml.template`: Workers config template (bindings, routes, D1, assets).
+- `type.d.ts`: shared types for bindings and data models.
+
+## Build, Test, and Development Commands
+- `pnpm -C frontend build`: Type-checks and builds the admin UI into `public/`.
+- `pnpm dev`: Runs the Worker locally via `wrangler dev` (expects a local `wrangler.toml`).
+- `pnpm run deploy`: Deploys the Worker to Cloudflare.
+- `pnpm run cf-typegen`: Generates Cloudflare bindings/types.
+
+## Coding Style & Naming Conventions
+- TypeScript throughout; follow existing patterns and file layout.
+- Indentation: 4 spaces in backend files, 2 spaces in frontend TSX (match existing).
+- API routes: `src/admin/*_api.ts`, provider files in `src/providers/`.
+- Channel types: use string literals (e.g., `openai-responses`, `azure-openai-responses`).
+
+## Testing Guidelines
+- No dedicated test framework is currently configured.
+- Use `pnpm -C frontend build` as a basic safety check for UI changes.
+- For backend changes, run `pnpm dev` and validate with the API Test page.
+
+## Commit & Pull Request Guidelines
+- No formal commit conventions are documented in-repo; use clear, imperative messages (e.g., "Add responses proxy").
+- PRs should include:
+  - Summary of changes.
+  - Notes on config changes (`wrangler.toml`, env vars).
+  - Screenshots for UI changes (from `frontend/`).
+
+## Security & Configuration Tips
+- Admin endpoints require `x-admin-token` (`ADMIN_TOKEN` binding).
+- Tokens and channel configs are stored in D1; validate permissions and quotas.
+- For Azure Responses v1, leave `api_version` empty and set `endpoint` to the resource host.
+- `wrangler.toml` is git-ignored; copy from `wrangler.toml.template` for local use.