feat!: force to use the bin dir as the data dir (close #2108)

- move default log path to `data/log/log.log`
- replace `--conf` with `--data`

cmd/flags/config.go

@@ -1,8 +1,9 @@
 package flags
 
 var (
-	Config   string // config file
-	Debug    bool
-	NoPrefix bool
-	Dev      bool
+	DataDir     string
+	Debug       bool
+	NoPrefix    bool
+	Dev         bool
+	ForceBinDir bool
 )