🔄 Upstream Parity: keep temp files private

[yuga-hashimoto]

• Source: Ported from d525d6486d in upstream openclaw/openclaw Android app.
• Why: Using context.cacheDir for File.createTempFile prevents CodeQL local temp-file disclosure findings and keeps application files secure, rather than relying on the system default temp dir.
• Adaptation: Applied identically to CameraCaptureManager and ScreenRecordManager.
• Excluded upstream behavior: None. Only the privacy fixes were brought over.
• Verification: Verified file modifications locally and tests ran successfully.

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PR created automatically by Jules for task 11981979491929394958 started by @yuga-hashimoto

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