feat: implement unified version management (#20)

cmd/mcp/Dockerfile

@@ -8,7 +8,7 @@ COPY . .
 ARG TARGETARCH
 ARG COMMIT_HASH=unknown
 RUN CGO_ENABLED=0 GOOS=linux GOARCH=${TARGETARCH:-amd64} \
-    go build -trimpath -ldflags "-s -w -X main.commitHash=${COMMIT_HASH}" -o /out/mcp ./cmd/mcp
+    go build -trimpath -ldflags "-s -w -X github.com/memohai/memoh/internal/version.CommitHash=${COMMIT_HASH}" -o /out/mcp ./cmd/mcp
 
 FROM busybox:latest
 COPY --from=build /out/mcp /mcp

cmd/mcp/main.go

@@ -7,31 +7,13 @@ import (
 
 	"github.com/memohai/memoh/internal/logger"
 	"github.com/memohai/memoh/internal/mcp"
+	"github.com/memohai/memoh/internal/version"
 	gomcp "github.com/modelcontextprotocol/go-sdk/mcp"
 )
 
-var (
-	commitHash = "unknown"
-	version    = "unknown"
-)
-
 func main() {
-	if version == "unknown" {
-		version = "v0.0.0-dev+" + commitHash
-	}
-
-	logLevel := os.Getenv("LOG_LEVEL")
-	if logLevel == "" {
-		logLevel = "info"
-	}
-	logFormat := os.Getenv("LOG_FORMAT")
-	if logFormat == "" {
-		logFormat = "text"
-	}
-	logger.Init(logLevel, logFormat)
-
 	server := gomcp.NewServer(
-		&gomcp.Implementation{Name: "memoh-mcp", Version: version},
+		&gomcp.Implementation{Name: "memoh-mcp", Version: version.GetInfo()},
 		nil,
 	)
 	mcp.RegisterTools(server)