chore: add lychee.toml configuration and remove old markdown-link-check config

- Add lychee.toml with proper configuration for link checking
- Remove outdated markdown-link-check-config.json
- Update documentation references to use lychee.toml instead
- Configure proper timeouts, retries, and exclusions

Co-authored-by: huangyiirene <7665279+huangyiirene@users.noreply.github.com>

Author: Copilot

.github/README.md

@@ -18,7 +18,6 @@ This directory contains all GitHub-specific configuration and automation for the
 │   └── check-links.yml # Documentation link validation
 ├── dependabot.yml      # Automated dependency updates
 ├── labeler.yml         # PR labeling rules
-├── markdown-link-check-config.json  # Link checker config
 └── WORKFLOWS.md        # Detailed workflow documentation
 ```
 

.github/WORKFLOWS.md

@@ -221,11 +221,11 @@ docs: update architecture guide
 
 **Features:**
 - Checks all markdown files for broken links
-- Configurable via `.github/markdown-link-check-config.json`
+- Configurable via `lychee.toml` in repository root
 - Ignores localhost and internal anchors
 - Retries on 429 errors
 
-**Configuration:** `.github/markdown-link-check-config.json`
+**Configuration:** `lychee.toml`
 
 ---
 
@@ -292,7 +292,7 @@ To customize workflows:
 2. Update configuration files:
    - `.github/labeler.yml` - Label rules
    - `.github/dependabot.yml` - Dependency update settings
-   - `.github/markdown-link-check-config.json` - Link checker settings
+   - `lychee.toml` - Link checker settings (in repository root)
 
 ---
 

.github/markdown-link-check-config.json

@@ -0,0 +1,32 @@
+# Lychee link checker configuration
+
+# Exclude these patterns from checking
+exclude = [
+    # Local development URLs
+    "^http://localhost",
+    "^https://localhost",
+    
+    # Anchor links (internal page references)
+    "^#",
+]
+
+# HTTP request timeout in seconds
+timeout = 20
+
+# Maximum number of retries
+max_retries = 3
+
+# Retry on 429 (Too Many Requests)
+retry_wait_time = 2
+
+# Accept these status codes as valid
+accept = [200, 201, 204, 206, 301, 302, 307, 308]
+
+# User agent
+user_agent = "Mozilla/5.0 (compatible; lychee/0.21.0)"
+
+# Maximum number of concurrent requests
+max_concurrency = 8
+
+# Include verbosity in output
+verbose = true