feat: Sentinela v0.2.0 — Brazilian Financial Data API in Go

- 20 Go source files, single 16MB binary
- SQLite + FTS5 full-text search (pure Go, no CGO)
- BCB integration: Selic, CDI, IPCA, USD/BRL, EUR/BRL
- CVM integration: 2,524 companies from registry
- Fiber v2 REST API with 42 handlers
- Auto-seeds on first run (~5s for BCB + CVM)
- Token bucket rate limiter, optional API key auth
- Periodic sync scheduler (configurable)
- Graceful shutdown, structured logging (slog)
- All endpoints tested with real data

internal/api/handlers/health.go

@@ -0,0 +1,21 @@
+package handlers
+
+import (
+	"github.com/gofiber/fiber/v2"
+	"github.com/sentinela-go/internal/db"
+)
+
+type Handler struct {
+	db *db.DB
+}
+
+func New(database *db.DB) *Handler {
+	return &Handler{db: database}
+}
+
+func (h *Handler) Health(c *fiber.Ctx) error {
+	return c.JSON(fiber.Map{
+		"status":  "ok",
+		"service": "sentinela",
+	})
+}