🔄 Upstream Parity: Keep camera temp files private

[yuga-hashimoto]

• Source: Upstream commit d525d6486d (fix(android): keep camera temp files private).
• Why: Resolves a CodeQL local temp-file disclosure finding. Using the default File.createTempFile writes to the system's shared temp directory (java.io.tmpdir). Passing context.cacheDir ensures that the temporary files created during camera capture (.mp4 and .jpg) remain strictly within the app's isolated private cache storage, improving security and preventing potential IOException crashes on certain OEM setups.
• Adaptation: Directly applied the upstream changes to app/src/main/java/com/openclaw/assistant/node/CameraCaptureManager.kt by passing context.cacheDir in File.createTempFile for both .mp4 and .jpg creation flows, and updated the takeJpegWithExif helper signature.
• Excluded behavior: None, exactly matched the upstream logic for this localized fix.
• Verification: Verified compilation and ran ./gradlew app:testStandardDebugUnitTest, which succeeded. Code Review assessed the fix as #Correct#.

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PR created automatically by Jules for task 17626170818675022355 started by @yuga-hashimoto

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