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/xiaomi/README.md

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+# 小米 MiMo：来源导航
+
+[总索引](../../README.md) · [官网证据与边界](SOURCES.md)
+
+本目录包含 15 个单模型文件、2 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/xiaomi.json](access/providers--xiaomi.md)
+- [compute/model-specs/xiaomi.json](access/model-specs--xiaomi.md)
+
+## 模型
+
+- [`mimo-v2-flash`](models/mimo-v2-flash.md)
+- [`mimo-v2-omni`](models/mimo-v2-omni.md)
+- [`mimo-v2-pro`](models/mimo-v2-pro.md)
+- [`mimo-v2-tts`](models/mimo-v2-tts.md)
+- [`mimo-v2.5`](models/mimo-v2.5.md)
+- [`mimo-v2.5-asr`](models/mimo-v2.5-asr.md)
+- [`mimo-v2.5-pro`](models/mimo-v2.5-pro.md)
+- [`mimo-v2.5-tts`](models/mimo-v2.5-tts.md)
+- [`mimo-v2.5-tts-voiceclone`](models/mimo-v2.5-tts-voiceclone.md)
+- [`mimo-v2.5-tts-voicedesign`](models/mimo-v2.5-tts-voicedesign.md)
+- [`mimo-v2.6-flash`](models/mimo-v2.6-flash.md)
+- [`mimo-v2.6-pro`](models/mimo-v2.6-pro.md)
+- [`mimo-v2.6-pro-ultraspeed`](models/mimo-v2.6-pro-ultraspeed.md)
+- [`mimo-x-flash-preview`](models/mimo-x-flash-preview.md)
+- [`mimo-x-pro-preview`](models/mimo-x-pro-preview.md)