fix(i18n): translate hardcoded UI labels in Step1 ontology panel

Replace hardcoded English strings (GENERATED ENTITY TYPES, ATTRIBUTES,
EXAMPLES, etc.) and the Uploading message with i18n keys.
Add corresponding translations to all 4 locale files (ca/en/zh/es).

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

frontend/src/components/Step1GraphBuild.vue

@@ -31,7 +31,7 @@
           <div v-if="selectedOntologyItem" class="ontology-detail-overlay">
             <div class="detail-header">
                <div class="detail-title-group">
-                  <span class="detail-type-badge">{{ selectedOntologyItem.itemType === 'entity' ? 'ENTITY' : 'RELATION' }}</span>
+                  <span class="detail-type-badge">{{ selectedOntologyItem.itemType === 'entity' ? $t('step1.labelEntity') : $t('step1.labelRelation') }}</span>
                   <span class="detail-name">{{ selectedOntologyItem.name }}</span>
                </div>
                <button class="close-btn" @click="selectedOntologyItem = null">×</button>
@@ -41,7 +41,7 @@
                
                <!-- Attributes -->
                <div class="detail-section" v-if="selectedOntologyItem.attributes?.length">
-                  <span class="section-label">ATTRIBUTES</span>
+                  <span class="section-label">{{ $t('step1.labelAttributes') }}</span>
                   <div class="attr-list">
                      <div v-for="attr in selectedOntologyItem.attributes" :key="attr.name" class="attr-item">
                         <span class="attr-name">{{ attr.name }}</span>
@@ -53,7 +53,7 @@
 
                <!-- Examples (Entity) -->
                <div class="detail-section" v-if="selectedOntologyItem.examples?.length">
-                  <span class="section-label">EXAMPLES</span>
+                  <span class="section-label">{{ $t('step1.labelExamples') }}</span>
                   <div class="example-list">
                      <span v-for="ex in selectedOntologyItem.examples" :key="ex" class="example-tag">{{ ex }}</span>
                   </div>
@@ -61,7 +61,7 @@
 
                <!-- Source/Target (Relation) -->
                <div class="detail-section" v-if="selectedOntologyItem.source_targets?.length">
-                  <span class="section-label">CONNECTIONS</span>
+                  <span class="section-label">{{ $t('step1.labelConnections') }}</span>
                   <div class="conn-list">
                      <div v-for="(conn, idx) in selectedOntologyItem.source_targets" :key="idx" class="conn-item">
                         <span class="conn-node">{{ conn.source }}</span>
@@ -75,7 +75,7 @@
 
           <!-- Generated Entity Tags -->
           <div v-if="projectData?.ontology?.entity_types" class="tags-container" :class="{ 'dimmed': selectedOntologyItem }">
-            <span class="tag-label">GENERATED ENTITY TYPES</span>
+            <span class="tag-label">{{ $t('step1.labelEntityTypes') }}</span>
             <div class="tags-list">
               <span 
                 v-for="entity in projectData.ontology.entity_types" 
@@ -90,7 +90,7 @@
 
           <!-- Generated Relation Tags -->
           <div v-if="projectData?.ontology?.edge_types" class="tags-container" :class="{ 'dimmed': selectedOntologyItem }">
-            <span class="tag-label">GENERATED RELATION TYPES</span>
+            <span class="tag-label">{{ $t('step1.labelRelationTypes') }}</span>
             <div class="tags-list">
               <span 
                 v-for="rel in projectData.ontology.edge_types" 

frontend/src/views/MainView.vue

@@ -202,7 +202,7 @@ const handleNewProject = async () => {
   try {
     loading.value = true
     currentPhase.value = 0
-    ontologyProgress.value = { message: 'Uploading and analyzing docs...' }
+    ontologyProgress.value = { message: t('step1.analyzingDocs') }
     addLog('Starting ontology generation: Uploading files...')
     
     const formData = new FormData()

locales/ca.json

@@ -101,7 +101,14 @@
     "creating": "Creant...",
     "enterEnvSetup": "Entra a la configuració de l'entorn",
     "createSimulationFailed": "Error en crear la simulació: {error}",
-    "createSimulationException": "Excepció en crear la simulació: {error}"
+    "createSimulationException": "Excepció en crear la simulació: {error}",
+    "labelEntityTypes": "TIPUS D'ENTITAT GENERATS",
+    "labelRelationTypes": "TIPUS DE RELACIÓ GENERATS",
+    "labelEntity": "ENTITAT",
+    "labelRelation": "RELACIÓ",
+    "labelAttributes": "ATRIBUTS",
+    "labelExamples": "EXEMPLES",
+    "labelConnections": "CONNEXIONS"
   },
   "step2": {
     "simInstanceInit": "Inicialització de la instància de simulació",

locales/en.json

@@ -101,7 +101,14 @@
     "creating": "Creating...",
     "enterEnvSetup": "Enter Environment Setup",
     "createSimulationFailed": "Failed to create simulation: {error}",
-    "createSimulationException": "Simulation creation error: {error}"
+    "createSimulationException": "Simulation creation error: {error}",
+    "labelEntityTypes": "GENERATED ENTITY TYPES",
+    "labelRelationTypes": "GENERATED RELATION TYPES",
+    "labelEntity": "ENTITY",
+    "labelRelation": "RELATION",
+    "labelAttributes": "ATTRIBUTES",
+    "labelExamples": "EXAMPLES",
+    "labelConnections": "CONNECTIONS"
   },
   "step2": {
     "simInstanceInit": "Simulation Instance Initialization",

locales/es.json

@@ -101,7 +101,14 @@
     "creating": "Creando...",
     "enterEnvSetup": "Entrar a configuración del entorno",
     "createSimulationFailed": "Error al crear simulación: {error}",
-    "createSimulationException": "Excepción al crear simulación: {error}"
+    "createSimulationException": "Excepción al crear simulación: {error}",
+    "labelEntityTypes": "TIPOS DE ENTIDAD GENERADOS",
+    "labelRelationTypes": "TIPOS DE RELACIÓN GENERADOS",
+    "labelEntity": "ENTIDAD",
+    "labelRelation": "RELACIÓN",
+    "labelAttributes": "ATRIBUTOS",
+    "labelExamples": "EJEMPLOS",
+    "labelConnections": "CONEXIONES"
   },
   "step2": {
     "simInstanceInit": "Inicialización de instancia de simulación",

locales/zh.json

@@ -101,7 +101,14 @@
     "creating": "创建中...",
     "enterEnvSetup": "进入环境搭建",
     "createSimulationFailed": "创建模拟失败: {error}",
-    "createSimulationException": "创建模拟异常: {error}"
+    "createSimulationException": "创建模拟异常: {error}",
+    "labelEntityTypes": "生成的实体类型",
+    "labelRelationTypes": "生成的关系类型",
+    "labelEntity": "实体",
+    "labelRelation": "关系",
+    "labelAttributes": "属性",
+    "labelExamples": "示例",
+    "labelConnections": "连接"
   },
   "step2": {
     "simInstanceInit": "模拟实例初始化",