fix: responder a partir dos livros com embeddings em português

Usa o modelo multilingual, ignora trechos curtos e o template do Llama 3.2
para a resposta sair em uma frase completa. O chat deixa a API livre durante
a geração, o upload indexa o PDF e os agendamentos não são gravados duas vezes.

backend/app/main.py

@@ -1,5 +1,7 @@
+import asyncio
 import json
 import os
+import uuid
 from typing import List
 
 from fastapi import FastAPI, File, HTTPException, UploadFile
@@ -69,12 +71,30 @@ def load_schedules():
     return []
 
 
+def index_pdf(file_path: str, filename: str):
+    from app.services.pdf_processor import PDFProcessor
+    from app.utils.embeddings import EmbeddingService
+
+    title = os.path.splitext(os.path.basename(filename))[0].replace("-", " ").replace("_", " ")
+    processor = PDFProcessor(EmbeddingService())
+    chunks = processor.embed_chunks(
+        processor.load_and_split(
+            file_path,
+            {"title": title, "author": "Desconhecido", "type": "book"},
+        )
+    )
+    for chunk in chunks:
+        chunk["id"] = str(uuid.uuid4())
+    get_qdrant().add_chunks(chunks)
+
+
 def save_schedules(schedules: list):
     parent = os.path.dirname(SCHEDULES_PATH)
     if parent:
         os.makedirs(parent, exist_ok=True)
     with open(SCHEDULES_PATH, "w", encoding="utf-8") as handle:
         json.dump(schedules, handle, indent=2)
+        handle.write("\n")
 
 
 @app.get("/health")
@@ -96,7 +116,7 @@ async def get_books():
 
 
 @app.post("/api/chat", response_model=ChatResponse)
-async def chat(request: ChatRequest):
+def chat(request: ChatRequest):
     try:
         return get_rag().query(request.message, request.top_k)
     except Exception as exc:
@@ -114,7 +134,8 @@ async def upload_pdf(file: UploadFile = File(...)):
         content = await file.read()
         with open(file_path, "wb") as handle:
             handle.write(content)
-        return UploadResponse(message="File uploaded successfully", filename=file.filename)
+        await asyncio.to_thread(index_pdf, file_path, file.filename)
+        return UploadResponse(message="File uploaded and indexed", filename=file.filename)
     except Exception as exc:
         raise HTTPException(status_code=500, detail=str(exc)) from exc
 
@@ -126,15 +147,7 @@ async def get_schedules():
 
 @app.post("/api/schedules", response_model=ScheduleInfo)
 async def create_schedule(request: ScheduleRequest):
-    schedules = load_schedules()
     new_schedule = schedule_manager.add_schedule(request.model_dump())
-    if not any(item.get("id") == new_schedule["id"] for item in schedules):
-        schedules.append(new_schedule)
-        save_schedules(schedules)
-    try:
-        bot_service.add_schedule(new_schedule)
-    except Exception as exc:
-        print(f"Warning: Could not add schedule to bot: {exc}")
     return ScheduleInfo(**new_schedule)