fix: add go.sum and fixes

deploy/docker/Dockerfile.agent

@@ -0,0 +1,57 @@
+# ═══════════════════════════════════════════════════════════
+# 🐍 OPHION Agent - Dockerfile
+# ═══════════════════════════════════════════════════════════
+
+# Build stage
+FROM golang:1.22-alpine AS builder
+
+WORKDIR /build
+
+# Install dependencies
+RUN apk add --no-cache git ca-certificates
+
+# Copy go modules first (cache layer)
+COPY go.mod go.sum ./
+RUN go mod download
+
+# Copy source code
+COPY cmd/ ./cmd/
+COPY internal/ ./internal/
+
+# Build the agent binary
+RUN CGO_ENABLED=0 GOOS=linux GOARCH=amd64 \
+    go build -ldflags="-s -w" -o ophion-agent ./cmd/agent
+
+# Runtime stage
+FROM alpine:3.19
+
+LABEL org.opencontainers.image.title="OPHION Agent"
+LABEL org.opencontainers.image.description="Observability Agent - Metrics, Logs, Traces Collector"
+
+# Install runtime dependencies
+RUN apk add --no-cache ca-certificates tzdata
+
+# Create non-root user
+RUN addgroup -g 1000 ophion && \
+    adduser -u 1000 -G ophion -s /bin/sh -D ophion
+
+WORKDIR /app
+
+# Copy binary from builder
+COPY --from=builder /build/ophion-agent /app/
+
+USER ophion
+
+# Environment defaults
+ENV TZ=America/Sao_Paulo \
+    OPHION_SERVER=http://localhost:8080 \
+    OPHION_INTERVAL=30s \
+    OPHION_DOCKER=true \
+    OPHION_LOGS=true \
+    OPHION_OTLP=true \
+    OPHION_OTLP_PORT=4318
+
+# OTLP receiver port
+EXPOSE 4318
+
+ENTRYPOINT ["/app/ophion-agent"]