feat: 修复 H5 底部导航覆盖 + 更新项目进度文档

## H5 底部导航修复 (Bug #10)
- 精简 App.vue，移除重复 tabbar，仅保留全局样式
- uni-page 设置 height: calc(100% - 50px) + overflow-y: auto
- 内容区域精确停在底部导航上方，独立滚动不再叠加
- 恢复 custom-tab-bar 组件

## 项目进度文档
- PROGRESS.md 更新至 10 个 Bug 修复
- 新增 H5 底部导航修复记录
- 新增历史变更条目

backend/app/api/v1/training.py

@@ -0,0 +1,44 @@
+from fastapi import APIRouter, Depends
+from sqlalchemy.ext.asyncio import AsyncSession
+from typing import Annotated
+from app.database import get_db
+from app.services.corpus_trainer import CorpusTrainer
+from app.api.v1.deps import get_current_user_id
+
+router = APIRouter()
+
+
+@router.post("/corpus/run")
+async def run_corpus_training(
+    db: Annotated[AsyncSession, Depends(get_db)] = None,
+):
+    trainer = CorpusTrainer(db)
+    result = await trainer.run_pipeline()
+    return result
+
+
+@router.post("/corpus/embeddings")
+async def compute_embeddings(
+    batch_size: int = 50,
+    db: Annotated[AsyncSession, Depends(get_db)] = None,
+):
+    trainer = CorpusTrainer(db)
+    result = await trainer.compute_embeddings(batch_size)
+    return result
+
+
+@router.get("/corpus/stats")
+async def corpus_stats(
+    db: Annotated[AsyncSession, Depends(get_db)] = None,
+):
+    trainer = CorpusTrainer(db)
+    return await trainer.get_stats()
+
+
+@router.post("/corpus/deduplicate")
+async def deduplicate_corpus(
+    db: Annotated[AsyncSession, Depends(get_db)] = None,
+):
+    trainer = CorpusTrainer(db)
+    result = await trainer.deduplicate()
+    return result