docs: fix inaccuracies and add link/anchor validation tests

- Generate config.example.jsonc with a Linux socket path instead of Windows, so the example stays reproducible across platforms
- Document TsukiHime config (`tsukihime.*`), maturity-based known-word highlighting keys, and other config surfaces missing from the reference
- Correct secondary-subtitle auto-load defaults and Anki field-matching (case-insensitive) claims
- Expand Windows installation guide with winget/Scoop package tables and manual PATH setup
- Add docs-site/links.test.ts to catch broken internal links and heading-anchor mismatches
- Fix stale cross-references in jimaku-integration.md and demos.md

src/generate-config-example.test.ts

@@ -85,5 +85,5 @@ test('writeConfigExampleArtifacts creates parent directories for resolved output
 test('generateConfigExampleTemplate uses the canonical example socket path', () => {
   const template = generateConfigExampleTemplate();
 
-  assert.match(template, /"socketPath": "\\\\\\\\.\\\\pipe\\\\subminer-socket"/);
+  assert.match(template, /"socketPath": "\/tmp\/subminer-socket"/);
 });