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/config/config.go

@@ -0,0 +1,48 @@
+package config
+
+import (
+	"os"
+	"strconv"
+)
+
+type Config struct {
+	Port         int
+	DatabasePath string
+	RateLimit    int
+	APIKey       string
+	SyncInterval string
+	LogLevel     string
+}
+
+func Load() *Config {
+	c := &Config{
+		Port:         3333,
+		DatabasePath: "data/sentinela.db",
+		RateLimit:    100,
+		SyncInterval: "30m",
+		LogLevel:     "info",
+	}
+	if v := os.Getenv("PORT"); v != "" {
+		if n, err := strconv.Atoi(v); err == nil {
+			c.Port = n
+		}
+	}
+	if v := os.Getenv("DATABASE_PATH"); v != "" {
+		c.DatabasePath = v
+	}
+	if v := os.Getenv("RATE_LIMIT"); v != "" {
+		if n, err := strconv.Atoi(v); err == nil {
+			c.RateLimit = n
+		}
+	}
+	if v := os.Getenv("API_KEY"); v != "" {
+		c.APIKey = v
+	}
+	if v := os.Getenv("SYNC_INTERVAL"); v != "" {
+		c.SyncInterval = v
+	}
+	if v := os.Getenv("LOG_LEVEL"); v != "" {
+		c.LogLevel = v
+	}
+	return c
+}