ci: merge install into Unit Test stage, drop separate Install stage

Jenkinsfile

@@ -3,15 +3,12 @@
 import vn.fireflylab.pipeline.BranchStrategy
 
 // ── Stage functions ────────────────────────────────────────────────
-def executeInstall() {
-    stage('Install') {
-        container('node') { runNodeInstall() }
-    }
-}
-
 def executeUnitTest() {
     stage('Unit Test') {
-        container('node') { runNodeTest(testCmd: 'run test:coverage') }
+        container('node') {
+            runNodeInstall()
+            runNodeTest(testCmd: 'run test:coverage')
+        }
     }
 }
 
@@ -46,12 +43,12 @@ def executeBumpChart() {
 }
 
 // ── Pipeline ───────────────────────────────────────────────────────
-// PR-*          → install + test
+// PR-*          → test
-// feature/*     → install + test + scan + build + push
+// feature/*     → test + scan + build + push
-// develop       → install + test + scan + build + push
+// develop       → test + scan + build + push
-// main          → install + test + scan + build + push
+// main          → test + scan + build + push
-// release/x.y.z → install + test + scan + build + push
+// release/x.y.z → test + scan + build + push
-// hotfix/*      → install + test + scan + build + push
+// hotfix/*      → test + scan + build + push
 
 podTemplate(yaml: homelabK8sAgent(withTools: true, withSonar: true)) {
     node(POD_LABEL) {
@@ -59,40 +56,34 @@ podTemplate(yaml: homelabK8sAgent(withTools: true, withSonar: true)) {
             checkout scm
 
             BranchStrategy.prStrategy(env.BRANCH_NAME) {
-                executeInstall()
                 executeUnitTest()
             }
 
             BranchStrategy.featureStrategy(env.BRANCH_NAME) {
-                executeInstall()
                 executeUnitTest()
                 executeScanCodeQuality()
                 executeBuildPush()
             }
 
             BranchStrategy.developStrategy(env.BRANCH_NAME) {
-                executeInstall()
                 executeUnitTest()
                 executeScanCodeQuality()
                 executeBuildPush()
             }
 
             BranchStrategy.mainStrategy(env.BRANCH_NAME) {
-                executeInstall()
                 executeUnitTest()
                 executeScanCodeQuality()
                 executeBuildPush()
             }
 
             BranchStrategy.releaseStrategy(env.BRANCH_NAME) {
-                executeInstall()
                 executeUnitTest()
                 executeScanCodeQuality()
                 executeBuildPush()
             }
 
             BranchStrategy.hotfixStrategy(env.BRANCH_NAME) {
-                executeInstall()
                 executeUnitTest()
                 executeScanCodeQuality()
                 executeBuildPush()