feat: enhance Dockerfile for SQLite support and update main.go for MySQL connection; add sensor creation endpoint and improve wait-for-mqtt script

Dockerfile

@@ -2,16 +2,19 @@
 FROM golang:1.21-alpine AS builder
 WORKDIR /src
 
+# sqlite3 driver requires CGO; install build deps
+RUN apk add --no-cache build-base sqlite-dev
+
 COPY go.mod go.sum ./
 RUN go mod download
 COPY . .
 
-RUN CGO_ENABLED=0 GOOS=linux GOARCH=amd64 \
+RUN CGO_ENABLED=1 GOOS=linux GOARCH=amd64 \
     go build -ldflags "-s -w" -o /app/server ./cmd/server
 
 # Final image
 FROM alpine:3.18
-RUN apk add --no-cache ca-certificates netcat-openbsd curl
+RUN apk add --no-cache ca-certificates netcat-openbsd curl sqlite-libs
 COPY --from=builder /app/server /usr/local/bin/server
 COPY scripts/wait-for-mqtt.sh /usr/local/bin/wait-for-mqtt.sh
 RUN chmod +x /usr/local/bin/wait-for-mqtt.sh