docs: split model source records and unify project instructions (#113)

* docs: split model sources and consolidate project instructions

* docs: normalize empty model navigation footer

docs/model-sources/providers/baidu/README.md

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+# 百度千帆：来源导航
+
+[总索引](../../README.md) · [官网证据与边界](SOURCES.md)
+
+本目录包含 14 个单模型文件、3 个单接入面文件。核验日期与状态来自迁移前记录。
+
+## 接入面
+
+- [compute/providers/baidu.json](access/providers--baidu.md)
+- [compute/coding-plans/baidu-coding.json](access/coding-plans--baidu-coding.md)
+- [compute/model-specs/baidu.json](access/model-specs--baidu.md)
+
+## 模型
+
+- [`deepseek-v3.2`](models/deepseek-v3.2.md)
+- [`deepseek-v4-flash`](models/deepseek-v4-flash.md)
+- [`ernie-4.5-turbo-128k`](models/ernie-4.5-turbo-128k.md)
+- [`ernie-4.5-turbo-20260402`](models/ernie-4.5-turbo-20260402.md)
+- [`ernie-5.0`](models/ernie-5.0.md)
+- [`ernie-5.0-thinking-latest`](models/ernie-5.0-thinking-latest.md)
+- [`ernie-x1.1`](models/ernie-x1.1.md)
+- [`glm-5`](models/glm-5.md)
+- [`glm-5.1`](models/glm-5.1.md)
+- [`kimi-k2.5`](models/kimi-k2.5.md)
+- [`kimi-k2.6`](models/kimi-k2.6.md)
+- [`minimax-m2.5`](models/minimax-m2.5.md)
+- [`minimax-m2.7`](models/minimax-m2.7.md)
+- [`qianfan-code-latest`](models/qianfan-code-latest.md)