[Docs] Fill in stub pages, fix drift, and add a real Chinese translation

Four English pages were `[TBD]` placeholders and `examples/simulation.md`
carried 19 more `[TBD]` sections. Fill them in, verified against the
wrapper source rather than assumed:

- `getting_started/installation.md`: requirements, PyPI install, the three
  optional ML-backed algorithms and their CMake flags, source builds.
- `examples/analysis.md`: all 11 `AnalysisOption` fields and 5
  `AnalysisParam` fields with real defaults, output files, and the
  C-reader-only restriction.
- `api.md`: hand-written reference for the full exported surface,
  including the actual enum members (`ReqOp` is `OP_*`, not `READ`/`WRITE`).
- `developer.md`: layout, build system, testing, adding an algorithm, docs
  workflow, CI, releasing.
- `examples/simulation.md`: real parameters and defaults for every
  algorithm, plus the missing `Size` section, the `cache_size`-as-ratio
  behaviour, and a `CacheBase` method table.

Corrections to existing content: Python floor is 3.10 (not 3.9) per
`requires-python`; `int_freq` -> `init_freq`; a quickstart snippet used an
undefined `lcs`; the FAQ used an absolute URL that broke under locale
fallback. Two lists rendered as literal `*` characters because they lacked
a preceding blank line.

The Chinese tree was three orphaned files at non-mirroring paths, so they
never rendered, and they documented an API that does not exist
(`cache.get_hit_ratio()`, `PythonHookCache`, `SyntheticReader(dist=...)`).
Delete them and translate all ten pages at paths mirroring `en/`.
Link-target headings carry explicit `attr_list` anchor IDs so cross-page
anchors resolve identically in both languages. `nav_translations` gains the
three labels that were still English, and `Getting Started` becomes
"入门指南" so it no longer collides with the Quickstart page's own title.

`mkdocs build --strict` passes and all 11 anchors are present in the built
HTML. Also ignore `docs/site/`, since the existing rule only covered
`/site` at the repo root.

Author: haochengxia

.gitignore

@@ -153,6 +153,7 @@ venv.bak/
 
 # mkdocs documentation
 /site
+docs/site/
 
 # mypy
 .mypy_cache/

docs/mkdocs.yml

@@ -9,9 +9,9 @@ docs_dir: src
 nav:
   - Home: 
     - libCacheSim Python: index.md
-    - Getting Started: 
-      - getting_started/quickstart.md
+    - Getting Started:
       - getting_started/installation.md
+      - getting_started/quickstart.md
     - Examples:
       - examples/reader.md
       - examples/simulation.md
@@ -85,11 +85,14 @@ plugins:
           build: true
           nav_translations:
             Home: 首页
-            Getting Started: 快速开始
+            Getting Started: 入门指南
             User Guide: 用户指南
             Developer Guide: 开发者指南
             API Reference: API参考
             Examples: 使用示例
+            FAQ: 常见问题
+            General: 总览
+            API Documentation: API 文档
 
 markdown_extensions:
   - attr_list