[app-server-protocol] Add types for config (#7658)
Currently the config returned by `config/read` in untyped. Add types so
it's easier for client to parse the config. Since currently configs are
all defined in snake case we'll keep that instead of using camel case
like the rest of V2.
Sample output by testing using the app server test client:
```
{
< "id": "f28449f4-b015-459b-b07b-eef06980165d",
< "result": {
< "config": {
< "approvalPolicy": null,
< "compactPrompt": null,
< "developerInstructions": null,
< "features": {
< "experimental_use_rmcp_client": true
< },
< "forcedChatgptWorkspaceId": null,
< "forcedLoginMethod": null,
< "instructions": null,
< "model": "gpt-5.1-codex-max",
< "modelAutoCompactTokenLimit": null,
< "modelContextWindow": null,
< "modelProvider": null,
< "modelReasoningEffort": null,
< "modelReasoningSummary": null,
< "modelVerbosity": null,
< "model_providers": {
< "local": {
< "base_url": "http://localhost:8061/api/codex",
< "env_http_headers": {
< "ChatGPT-Account-ID": "OPENAI_ACCOUNT_ID"
< },
< "env_key": "CHATGPT_TOKEN_STAGING",
< "name": "local",
< "wire_api": "responses"
< }
< },
< "model_reasoning_effort": "medium",
< "notice": {
< "hide_gpt-5.1-codex-max_migration_prompt": true,
< "hide_gpt5_1_migration_prompt": true
< },
< "profile": null,
< "profiles": {},
< "projects": {
< "/Users/celia/code": {
< "trust_level": "trusted"
< },
< "/Users/celia/code/codex": {
< "trust_level": "trusted"
< },
< "/Users/celia/code/openai": {
< "trust_level": "trusted"
< }
< },
< "reviewModel": null,
< "sandboxMode": null,
< "sandboxWorkspaceWrite": null,
< "tools": {
< "viewImage": null,
< "webSearch": null
< }
< },
< "origins": {
< "features.experimental_use_rmcp_client": {
< "name": "user",
< "source": "/Users/celia/.codex/config.toml",
< "version": "sha256:a1d8eaedb5d9db5dfdfa69f30fa9df2efec66bb4dd46aa67f149fcc67cd0711c"
< },
< "model": {
< "name": "user",
< "source": "/Users/celia/.codex/config.toml",
< "version": "sha256:a1d8eaedb5d9db5dfdfa69f30fa9df2efec66bb4dd46aa67f149fcc67cd0711c"
< },
< "model_providers.local.base_url": {
< "name": "user",
< "source": "/Users/celia/.codex/config.toml",
< "version": "sha256:a1d8eaedb5d9db5dfdfa69f30fa9df2efec66bb4dd46aa67f149fcc67cd0711c"
< },
< "model_providers.local.env_http_headers.ChatGPT-Account-ID": {
< "name": "user",
< "source": "/Users/celia/.codex/config.toml",
< "version": "sha256:a1d8eaedb5d9db5dfdfa69f30fa9df2efec66bb4dd46aa67f149fcc67cd0711c"
< },
< "model_providers.local.env_key": {
< "name": "user",
< "source": "/Users/celia/.codex/config.toml",
< "version": "sha256:a1d8eaedb5d9db5dfdfa69f30fa9df2efec66bb4dd46aa67f149fcc67cd0711c"
< },
< "model_providers.local.name": {
< "name": "user",
< "source": "/Users/celia/.codex/config.toml",
< "version": "sha256:a1d8eaedb5d9db5dfdfa69f30fa9df2efec66bb4dd46aa67f149fcc67cd0711c"
< },
< "model_providers.local.wire_api": {
< "name": "user",
< "source": "/Users/celia/.codex/config.toml",
< "version": "sha256:a1d8eaedb5d9db5dfdfa69f30fa9df2efec66bb4dd46aa67f149fcc67cd0711c"
< },
< "model_reasoning_effort": {
< "name": "user",
< "source": "/Users/celia/.codex/config.toml",
< "version": "sha256:a1d8eaedb5d9db5dfdfa69f30fa9df2efec66bb4dd46aa67f149fcc67cd0711c"
< },
< "notice.hide_gpt-5.1-codex-max_migration_prompt": {
< "name": "user",
< "source": "/Users/celia/.codex/config.toml",
< "version": "sha256:a1d8eaedb5d9db5dfdfa69f30fa9df2efec66bb4dd46aa67f149fcc67cd0711c"
< },
< "notice.hide_gpt5_1_migration_prompt": {
< "name": "user",
< "source": "/Users/celia/.codex/config.toml",
< "version": "sha256:a1d8eaedb5d9db5dfdfa69f30fa9df2efec66bb4dd46aa67f149fcc67cd0711c"
< },
< "projects./Users/celia/code.trust_level": {
< "name": "user",
< "source": "/Users/celia/.codex/config.toml",
< "version": "sha256:a1d8eaedb5d9db5dfdfa69f30fa9df2efec66bb4dd46aa67f149fcc67cd0711c"
< },
< "projects./Users/celia/code/codex.trust_level": {
< "name": "user",
< "source": "/Users/celia/.codex/config.toml",
< "version": "sha256:a1d8eaedb5d9db5dfdfa69f30fa9df2efec66bb4dd46aa67f149fcc67cd0711c"
< },
< "projects./Users/celia/code/openai.trust_level": {
< "name": "user",
< "source": "/Users/celia/.codex/config.toml",
< "version": "sha256:a1d8eaedb5d9db5dfdfa69f30fa9df2efec66bb4dd46aa67f149fcc67cd0711c"
< },
< "tools.web_search": {
< "name": "user",
< "source": "/Users/celia/.codex/config.toml",
< "version": "sha256:a1d8eaedb5d9db5dfdfa69f30fa9df2efec66bb4dd46aa67f149fcc67cd0711c"
< }
< }
< }
< }
```
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