feat(core): support ai network search (#9357)

### What Changed?
- Add `PerplexityProvider` in backend.
- Update session prompt name if user toggle network search mode in chat panel.
- Add experimental flag for AI network search feature.
- Add unit tests and e2e tests.

Search results are streamed and appear word for word:

<div class='graphite__hidden'>
          <div>🎥 Video uploaded on Graphite:</div>
            <a href="https://app.graphite.dev/media/video/sJGviKxfE3Ap685cl5bj/56f6ec7b-4b21-405f-9612-43e083f6fb84.mov">
              <img src="https://app.graphite.dev/api/v1/graphite/video/thumbnail/sJGviKxfE3Ap685cl5bj/56f6ec7b-4b21-405f-9612-43e083f6fb84.mov">
            </a>
          </div>
<video src="https://graphite-user-uploaded-assets-prod.s3.amazonaws.com/sJGviKxfE3Ap685cl5bj/56f6ec7b-4b21-405f-9612-43e083f6fb84.mov">录屏2024-12-27 18.58.40.mov</video>

Click the little globe icon to manually turn on/off Internet search:
<div class='graphite__hidden'>
          <div>🎥 Video uploaded on Graphite:</div>
            <a href="https://app.graphite.dev/media/video/sJGviKxfE3Ap685cl5bj/778f1406-bf29-498e-a90d-7dad813392d1.mov">
              <img src="https://app.graphite.dev/api/v1/graphite/video/thumbnail/sJGviKxfE3Ap685cl5bj/778f1406-bf29-498e-a90d-7dad813392d1.mov">
            </a>
          </div>
<video src="https://graphite-user-uploaded-assets-prod.s3.amazonaws.com/sJGviKxfE3Ap685cl5bj/778f1406-bf29-498e-a90d-7dad813392d1.mov">录屏2024-12-27 19.01.16.mov</video>

When there is an image, it will automatically switch to the openai model:

<div class='graphite__hidden'>
          <div>🎥 Video uploaded on Graphite:</div>
            <a href="https://app.graphite.dev/media/video/sJGviKxfE3Ap685cl5bj/56431d8e-75e1-4d84-ab4a-b6636042cc6a.mov">
              <img src="https://app.graphite.dev/api/v1/graphite/video/thumbnail/sJGviKxfE3Ap685cl5bj/56431d8e-75e1-4d84-ab4a-b6636042cc6a.mov">
            </a>
          </div>
<video src="https://graphite-user-uploaded-assets-prod.s3.amazonaws.com/sJGviKxfE3Ap685cl5bj/56431d8e-75e1-4d84-ab4a-b6636042cc6a.mov">录屏2024-12-27 19.02.13.mov</video>

.github/actions/copilot-test/action.yml

@@ -26,6 +26,7 @@ runs:
         DEV_SERVER_URL: http://localhost:8080
         COPILOT_OPENAI_API_KEY: ${{ inputs.openai-key }}
         COPILOT_FAL_API_KEY: ${{ inputs.fal-key }}
+        COPILOT_PERPLEXITY_API_KEY: ${{ inputs.perplexity-key }}
 
     - name: Upload test results
       if: ${{ failure() }}

.github/actions/deploy/deploy.mjs

@@ -17,6 +17,7 @@ const {
   METRICS_CUSTOMER_IO_TOKEN,
   COPILOT_OPENAI_API_KEY,
   COPILOT_FAL_API_KEY,
+  COPILOT_PERPLEXITY_API_KEY,
   COPILOT_UNSPLASH_API_KEY,
   MAILER_SENDER,
   MAILER_USER,
@@ -147,6 +148,7 @@ const createHelmCommand = ({ isDryRun }) => {
     `--set        graphql.app.copilot.enabled=true`,
     `--set-string graphql.app.copilot.openai.key="${COPILOT_OPENAI_API_KEY}"`,
     `--set-string graphql.app.copilot.fal.key="${COPILOT_FAL_API_KEY}"`,
+    `--set-string graphql.app.copilot.perplexity.key="${COPILOT_PERPLEXITY_API_KEY}"`,
     `--set-string graphql.app.copilot.unsplash.key="${COPILOT_UNSPLASH_API_KEY}"`,
     `--set-string graphql.app.mailer.sender="${MAILER_SENDER}"`,
     `--set-string graphql.app.mailer.user="${MAILER_USER}"`,

.github/helm/affine/charts/graphql/templates/deployment.yaml

@@ -157,6 +157,11 @@ spec:
               secretKeyRef:
                 name: "{{ .Values.app.copilot.secretName }}"
                 key: falSecret
+          - name: COPILOT_PERPLEXITY_API_KEY
+            valueFrom:
+              secretKeyRef:
+                name: "{{ .Values.app.copilot.secretName }}"
+                key: perplexitySecret
           - name: COPILOT_UNSPLASH_API_KEY
             valueFrom:
               secretKeyRef:

.github/workflows/build-test.yml

@@ -531,6 +531,7 @@ jobs:
           CARGO_TARGET_DIR: '${{ github.workspace }}/target'
           COPILOT_OPENAI_API_KEY: ${{ secrets.COPILOT_OPENAI_API_KEY }}
           COPILOT_FAL_API_KEY: ${{ secrets.COPILOT_FAL_API_KEY }}
+          COPILOT_PERPLEXITY_API_KEY: ${{ secrets.COPILOT_PERPLEXITY_API_KEY }}
 
       - name: Upload server test coverage results
         if: ${{ steps.check-blocksuite-update.outputs.skip != 'true' || steps.apifilter.outputs.changed == 'true' }}
@@ -619,6 +620,7 @@ jobs:
           script: yarn affine @affine-test/affine-cloud-copilot e2e --forbid-only --shard=${{ matrix.shardIndex }}/${{ matrix.shardTotal }}
           openai-key: ${{ secrets.COPILOT_OPENAI_API_KEY }}
           fal-key: ${{ secrets.COPILOT_FAL_API_KEY }}
+          perplexity-key: ${{ secrets.COPILOT_PERPLEXITY_API_KEY }}
 
   server-e2e-test:
     name: ${{ matrix.tests.name }}
@@ -703,6 +705,7 @@ jobs:
           DEV_SERVER_URL: http://localhost:8080
           COPILOT_OPENAI_API_KEY: 1
           COPILOT_FAL_API_KEY: 1
+          COPILOT_PERPLEXITY_API_KEY: 1
 
       - name: Upload test results
         if: ${{ failure() }}

.github/workflows/copilot-test.yml

@@ -84,6 +84,7 @@ jobs:
           CARGO_TARGET_DIR: '${{ github.workspace }}/target'
           COPILOT_OPENAI_API_KEY: ${{ secrets.COPILOT_OPENAI_API_KEY }}
           COPILOT_FAL_API_KEY: ${{ secrets.COPILOT_FAL_API_KEY }}
+          COPILOT_PERPLEXITY_API_KEY: ${{ secrets.COPILOT_PERPLEXITY_API_KEY }}
 
       - name: Upload server test coverage results
         uses: codecov/codecov-action@v5
@@ -147,6 +148,7 @@ jobs:
           script: yarn affine @affine-test/affine-cloud-copilot e2e --forbid-only --shard=${{ matrix.shardIndex }}/${{ matrix.shardTotal }}
           openai-key: ${{ secrets.COPILOT_OPENAI_API_KEY }}
           fal-key: ${{ secrets.COPILOT_FAL_API_KEY }}
+          perplexity-key: ${{ secrets.COPILOT_PERPLEXITY_API_KEY }}
 
   test-done:
     needs:

.github/workflows/deploy.yml

@@ -98,6 +98,7 @@ jobs:
           CAPTCHA_TURNSTILE_SECRET: ${{ secrets.CAPTCHA_TURNSTILE_SECRET }}
           COPILOT_OPENAI_API_KEY: ${{ secrets.COPILOT_OPENAI_API_KEY }}
           COPILOT_FAL_API_KEY: ${{ secrets.COPILOT_FAL_API_KEY }}
+          COPILOT_PERPLEXITY_API_KEY: ${{ secrets.COPILOT_PERPLEXITY_API_KEY }}
           COPILOT_UNSPLASH_API_KEY: ${{ secrets.COPILOT_UNSPLASH_API_KEY }}
           METRICS_CUSTOMER_IO_TOKEN: ${{ secrets.METRICS_CUSTOMER_IO_TOKEN }}
           MAILER_SENDER: ${{ secrets.OAUTH_EMAIL_SENDER }}