perf(ranking): otimizar paginação usando Oracle direto

- Remover carregamento de 350k registros em memória no startup
- Refatorar endpoints para buscar dados direto do Oracle:
  - ranking_paginado
  - buscar_por_nome
  - ranking_estatisticas
  - obter_posicao_ranking
- Adicionar healthcheck leve no Oracle com start_period de 60s
- Corrigir start-ngrok.sh para subir todos os containers
- Adicionar domínio ngrok-free.dev no vite.config.js

docker-compose.yml

@@ -33,8 +33,6 @@ services:
     build:
       context: ./frontend
       dockerfile: Dockerfile
-    depends_on:
-      - backend
     ports:
       - "5173:5173"
     environment:
@@ -52,26 +50,27 @@ services:
     restart: unless-stopped
     
   oracle18c:
-      container_name: oracle18c
-      image: gvenzl/oracle-xe:18-slim
-      environment:
-        - ORACLE_PASSWORD=local123
-        - ORACLE_CHARACTERSET=AL32UTF8
-        - APP_USER=local123
-        - APP_USER_PASSWORD=local123
-        - TZ=America/Sao_Paulo
-      ports:
-        - "1521:1521"
-        - "5500:5500"
-      volumes:
-        - oracle_data:/opt/oracle/oradata
-      healthcheck:
-        test: ["CMD", "bash", "-c", "echo 'SELECT 1 FROM DUAL;' | sqlplus -s SYSTEM/\"$${ORACLE_PASSWORD}\"@localhost:1521/XEPDB1"]
-        interval: 30s
-        timeout: 10s
-        retries: 20
-      networks:
-        - shared_network    
+    container_name: oracle18c
+    image: gvenzl/oracle-xe:18-slim
+    environment:
+      - ORACLE_PASSWORD=local123
+      - ORACLE_CHARACTERSET=AL32UTF8
+      - APP_USER=local123
+      - APP_USER_PASSWORD=local123
+      - TZ=America/Sao_Paulo
+    ports:
+      - "1521:1521"
+      - "5500:5500"
+    volumes:
+      - oracle_data:/opt/oracle/oradata
+    healthcheck:
+      test: ["CMD", "bash", "-c", "echo 'SELECT 1 FROM DUAL;' | sqlplus -s SYSTEM/local123@localhost:1521/XEPDB1 | grep -q 1"]
+      interval: 10s
+      timeout: 5s
+      retries: 30
+      start_period: 60s
+    networks:
+      - shared_network    
 
 networks:
   shared_network: