feat: Update Captain navigation structure (#12761)

# Pull Request Template

## Description

This PR includes an update to the Captain navigation structure.

## Route Structure

```javascript
1. captain_assistants_responses_index    → /captain/:assistantId/faqs
2. captain_assistants_documents_index    → /captain/:assistantId/documents
3. captain_assistants_scenarios_index    → /captain/:assistantId/scenarios
4. captain_assistants_playground_index   → /captain/:assistantId/playground
5. captain_assistants_inboxes_index      → /captain/:assistantId/inboxes
6. captain_tools_index                   → /captain/tools
7. captain_assistants_settings_index     → /captain/:assistantId/settings
8. captain_assistants_guardrails_index   → /captain/:assistantId/settings/guardrails
9. captain_assistants_guidelines_index   → /captain/:assistantId/settings/guidelines
10. captain_assistants_index             → /captain/:navigationPath
```

**How it works:**

1. User clicks sidebar item → Routes to `captain_assistants_index` with
`navigationPath`
2. `AssistantsIndexPage` validates route and gets last active assistant,
if not redirects to assistant create page.
3. Routes to actual page: `/captain/:assistantId/:page`
4. Page loads with correct assistant context

Fixes
https://linear.app/chatwoot/issue/CW-5832/updating-captain-navigation

## Type of change

- [x] New feature (non-breaking change which adds functionality)

## How Has This Been Tested?




## Checklist:

- [x] My code follows the style guidelines of this project
- [x] I have performed a self-review of my code
- [ ] I have commented on my code, particularly in hard-to-understand
areas
- [ ] I have made corresponding changes to the documentation
- [x] My changes generate no new warnings
- [ ] I have added tests that prove my fix is effective or that my
feature works
- [x] New and existing unit tests pass locally with my changes
- [ ] Any dependent changes have been merged and published in downstream
modules

---------

Co-authored-by: Pranav <pranav@chatwoot.com>
Co-authored-by: Sojan Jose <sojan@pepalo.com>

app/javascript/dashboard/components-next/captain/pageComponents/assistant/settings/AssistantSystemSettingsForm.vue

@@ -3,6 +3,8 @@ import { reactive, computed, watch } from 'vue';
 import { useI18n } from 'vue-i18n';
 import { useVuelidate } from '@vuelidate/core';
 import { minLength } from '@vuelidate/validators';
+import { FEATURE_FLAGS } from 'dashboard/featureFlags';
+import { useAccount } from 'dashboard/composables/useAccount';
 
 import Button from 'dashboard/components-next/button/Button.vue';
 import Editor from 'dashboard/components-next/Editor/Editor.vue';
@@ -17,10 +19,16 @@ const props = defineProps({
 const emit = defineEmits(['submit']);
 
 const { t } = useI18n();
+const { isCloudFeatureEnabled } = useAccount();
+
+const isCaptainV2Enabled = computed(() =>
+  isCloudFeatureEnabled(FEATURE_FLAGS.CAPTAIN_V2)
+);
 
 const initialState = {
   handoffMessage: '',
   resolutionMessage: '',
+  instructions: '',
   temperature: 1,
 };
 
@@ -29,6 +37,7 @@ const state = reactive({ ...initialState });
 const validationRules = {
   handoffMessage: { minLength: minLength(1) },
   resolutionMessage: { minLength: minLength(1) },
+  instructions: { minLength: minLength(1) },
 };
 
 const v$ = useVuelidate(validationRules, state);
@@ -40,20 +49,30 @@ const getErrorMessage = field => {
 const formErrors = computed(() => ({
   handoffMessage: getErrorMessage('handoffMessage'),
   resolutionMessage: getErrorMessage('resolutionMessage'),
+  instructions: getErrorMessage('instructions'),
 }));
 
 const updateStateFromAssistant = assistant => {
   const { config = {} } = assistant;
   state.handoffMessage = config.handoff_message;
   state.resolutionMessage = config.resolution_message;
+  state.instructions = config.instructions;
   state.temperature = config.temperature || 1;
 };
 
 const handleSystemMessagesUpdate = async () => {
-  const result = await Promise.all([
+  const validations = [
     v$.value.handoffMessage.$validate(),
     v$.value.resolutionMessage.$validate(),
-  ]).then(results => results.every(Boolean));
+  ];
+
+  if (!isCaptainV2Enabled.value) {
+    validations.push(v$.value.instructions.$validate());
+  }
+
+  const result = await Promise.all(validations).then(results =>
+    results.every(Boolean)
+  );
   if (!result) return;
 
   const payload = {
@@ -65,6 +84,10 @@ const handleSystemMessagesUpdate = async () => {
     },
   };
 
+  if (!isCaptainV2Enabled.value) {
+    payload.config.instructions = state.instructions;
+  }
+
   emit('submit', payload);
 };
 
@@ -95,6 +118,16 @@ watch(
       :message-type="formErrors.resolutionMessage ? 'error' : 'info'"
     />
 
+    <Editor
+      v-if="!isCaptainV2Enabled"
+      v-model="state.instructions"
+      :label="t('CAPTAIN.ASSISTANTS.FORM.INSTRUCTIONS.LABEL')"
+      :placeholder="t('CAPTAIN.ASSISTANTS.FORM.INSTRUCTIONS.PLACEHOLDER')"
+      :message="formErrors.instructions"
+      :max-length="20000"
+      :message-type="formErrors.instructions ? 'error' : 'info'"
+    />
+
     <div class="flex flex-col gap-2">
       <label class="text-sm font-medium text-n-slate-12">
         {{ t('CAPTAIN.ASSISTANTS.FORM.TEMPERATURE.LABEL') }}