fix(ci): resolve PR #89 CI issues

- Replace github.com/maruel/duplo with github.com/mibk/dupl to fix metrics job
- Update verification command from duplo to dupl
- Add HTML duplication report generation in quality dashboard
- Update all Go setup actions to use go-version-file: go.mod instead of hardcoded version
- Remove unused encoding/json import from pkg/knowledge/lazy_loader.go

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

Author: thc1006

.github/workflows/quality-gate.yml

@@ -120,7 +120,7 @@ jobs:
       - name: 🐹 Setup Go
         uses: actions/setup-go@v5
         with:
-          go-version: ${{ env.GO_VERSION }}
+          go-version-file: go.mod
           cache: true
 
       - name: 📋 Cache Go Modules
@@ -246,7 +246,7 @@ jobs:
       - name: 🐹 Setup Go
         uses: actions/setup-go@v5
         with:
-          go-version: ${{ env.GO_VERSION }}
+          go-version-file: go.mod
           cache: true
 
       - name: 🔍 Cache golangci-lint
@@ -348,7 +348,7 @@ jobs:
       - name: 🐹 Setup Go
         uses: actions/setup-go@v5
         with:
-          go-version: ${{ env.GO_VERSION }}
+          go-version-file: go.mod
           cache: true
 
       - name: 🔒 Install Security Tools
@@ -436,7 +436,7 @@ jobs:
       - name: 🐹 Setup Go
         uses: actions/setup-go@v5
         with:
-          go-version: ${{ env.GO_VERSION }}
+          go-version-file: go.mod
           cache: true
 
       - name: 🔧 Install Quality Analysis Tools
@@ -451,7 +451,7 @@ jobs:
           go install github.com/uudashr/gocognit/cmd/gocognit@v1.1.2
           
           echo "Installing code duplication detector..."
-          go install github.com/maruel/duplo@latest
+          go install github.com/mibk/dupl@latest
           
           # Add Go bin to PATH for subsequent steps
           echo "$(go env GOPATH)/bin" >> $GITHUB_PATH

pkg/knowledge/lazy_loader.go

@@ -4,7 +4,6 @@ import (
 	"bytes"
 	"compress/gzip"
 	"encoding/gob"
-	"encoding/json"
 	"fmt"
 	"strings"
 	"sync"