fix: resolve critical bugs and refactor code structure

P0 Fixes:
- Fix potential panic in factory.go due to unsafe type assertion
- Fix VIP CIDR mask being lost during parsing (was hardcoded to /32)

P1 Fixes:
- Fix go.mod incorrect indirect dependency markers
- Fix receiveLoop blocking issue preventing graceful shutdown

Refactoring:
- Split state.go into state.go, timer.go, priority.go, history.go
- Split monitor.go into monitor.go and manager.go
- Add IncreasePriority() method for complete priority adjustment
- Fix go vet format string warning in test.go

🤖 Generated with [Qoder][https://qoder.com]

internal/cmd/test.go

@@ -367,7 +367,7 @@ func (t *EnvironmentTest) TestCloudEnvironment() {
 		if err == nil {
 			cloudDetected = true
 			t.AddResult("云环境", !test.isFatal, fmt.Sprintf("检测到%s环境", test.name), test.isFatal)
-			t.log.Warn(test.solution)
+			t.log.Warn("%s", test.solution)
 		}
 	}