test: add Gemini multimodal integration test cassettes

Record VCR cassettes for Gemini multimodal tests and add missing
TextFile import.

lib/crewai/tests/cassettes/llms/TestGeminiMultimodalIntegration.test_analyze_text_file.yaml

@@ -0,0 +1,65 @@
+interactions:
+- request:
+    body: '{"contents": [{"parts": [{"text": "Summarize what this text file says in
+      one sentence."}], "role": "user"}], "generationConfig": {}}'
+    headers:
+      User-Agent:
+      - X-USER-AGENT-XXX
+      accept:
+      - '*/*'
+      accept-encoding:
+      - ACCEPT-ENCODING-XXX
+      connection:
+      - keep-alive
+      content-length:
+      - '132'
+      content-type:
+      - application/json
+      host:
+      - generativelanguage.googleapis.com
+      x-goog-api-client:
+      - google-genai-sdk/1.49.0 gl-python/3.12.10
+      x-goog-api-key:
+      - X-GOOG-API-KEY-XXX
+    method: POST
+    uri: https://generativelanguage.googleapis.com/v1beta/models/gemini-2.0-flash:generateContent
+  response:
+    body:
+      string: "{\n  \"candidates\": [\n    {\n      \"content\": {\n        \"parts\":
+        [\n          {\n            \"text\": \"Please provide the text file so I
+        can summarize it for you. I need the content of the file to be able to understand
+        and summarize it in one sentence.\\n\"\n          }\n        ],\n        \"role\":
+        \"model\"\n      },\n      \"finishReason\": \"STOP\",\n      \"avgLogprobs\":
+        -0.17782547979643851\n    }\n  ],\n  \"usageMetadata\": {\n    \"promptTokenCount\":
+        11,\n    \"candidatesTokenCount\": 33,\n    \"totalTokenCount\": 44,\n    \"promptTokensDetails\":
+        [\n      {\n        \"modality\": \"TEXT\",\n        \"tokenCount\": 11\n
+        \     }\n    ],\n    \"candidatesTokensDetails\": [\n      {\n        \"modality\":
+        \"TEXT\",\n        \"tokenCount\": 33\n      }\n    ]\n  },\n  \"modelVersion\":
+        \"gemini-2.0-flash\",\n  \"responseId\": \"b-dyabKwN8a9jrEP7JT1yAo\"\n}\n"
+    headers:
+      Alt-Svc:
+      - h3=":443"; ma=2592000,h3-29=":443"; ma=2592000
+      Content-Type:
+      - application/json; charset=UTF-8
+      Date:
+      - Fri, 23 Jan 2026 03:13:52 GMT
+      Server:
+      - scaffolding on HTTPServer2
+      Server-Timing:
+      - gfet4t7; dur=631
+      Transfer-Encoding:
+      - chunked
+      Vary:
+      - Origin
+      - X-Origin
+      - Referer
+      X-Content-Type-Options:
+      - X-CONTENT-TYPE-XXX
+      X-Frame-Options:
+      - X-FRAME-OPTIONS-XXX
+      X-XSS-Protection:
+      - '0'
+    status:
+      code: 200
+      message: OK
+version: 1

lib/crewai/tests/llms/test_multimodal_integration.py

@@ -9,7 +9,7 @@ from pathlib import Path
 import pytest
 
 from crewai.llm import LLM
-from crewai_files import File, ImageFile, PDFFile, format_multimodal_content
+from crewai_files import File, ImageFile, PDFFile, TextFile, format_multimodal_content
 
 
 # Path to test data files