chore: address PR #150 review — revert config defaults, strip BOM, unvendor web/

- config.yaml.example: restore gpt-5.4 / en (unintentional flip to local
  dev values openai/deepseek-v4-flash / zh)
- openkb/cli.py, tests/test_api.py: remove stray UTF-8 BOM
- web/: stop vendoring the built bundle; add web/ to .gitignore; README
  notes the Workbench UI requires `npm run build` (API-only otherwise)

Refs: PR #150

Author: 408645320-arch

.gitignore

@@ -19,3 +19,6 @@ kbs/
 # Local only
 docs/
 .claude/
+
+# Built Workbench web bundle (regenerate with `cd frontend && npm install && npm run build`)
+web/

README.md

@@ -140,6 +140,8 @@ pip install -e ".[api]"
 python -m openkb.api --host 127.0.0.1 --port 8000                      # serves the API + Workbench at http://127.0.0.1:8000/
 ```
 
+> **No build, no UI.** If you skip `npm run build`, the `web/` bundle is absent and `openkb-api` serves only the REST API under `/api/v1` — visiting `/` returns a 404. The Workbench web UI appears only after you build `frontend/` at least once.
+
 Open `http://127.0.0.1:8000/` in your browser. On first launch a **Connection Settings** dialog asks for the API base (leave blank for same-origin) and the bearer token. The Workbench then provides:
 
 - **Overview** — index/concept/summary/report stat cards, clickable concept chips, recent documents, and last-compile/lint activity.

config.yaml.example

@@ -1,5 +1,5 @@
-model: openai/deepseek-v4-flash                   # LLM model (any LiteLLM-supported provider)
-language: zh                     # Wiki output language
+model: gpt-5.4                   # LLM model (any LiteLLM-supported provider)
+language: en                     # Wiki output language
 pageindex_threshold: 20          # PDF pages threshold for PageIndex
 
 # Optional: override the entity-type vocabulary used for entity pages.

openkb/cli.py

@@ -1,4 +1,4 @@
-"""OpenKB CLI — command-line interface for the knowledge base workflow."""
+"""OpenKB CLI — command-line interface for the knowledge base workflow."""
 from __future__ import annotations
 
 # Silence import-time warnings (e.g. pydub's missing-ffmpeg warning emitted

tests/test_api.py

@@ -1,4 +1,4 @@
-from __future__ import annotations
+from __future__ import annotations
 
 import json
 from typing import Any