🔄 Upstream Parity: keep media temp files private

[yuga-hashimoto]

• Source: Ported from upstream OpenClaw Android repository (commit d525d6486d305482906b974136b8d25395211709) "fix(android): keep camera temp files private" by Vincent Koc.
• Why: Fixes CodeQL local temp-file disclosure findings and improves reliability by explicitly providing context.cacheDir when using File.createTempFile for camera and screen recording media captures, instead of relying on the system default java.io.tmpdir which can be unreliable or insecure on certain Android OEM flavors.
• Adaptation: Applied the fix directly to CameraCaptureManager.kt and ScreenRecordManager.kt. Refactored the signature of the private extension function takeJpegWithExif in CameraCaptureManager to accept the directory parameter from the caller, exactly mirroring the upstream approach.
• Excluded upstream behavior: None, fully ported the fix for both managers.
• Verification: Built and verified changes. Passed the standard unit test suite via ./gradlew app:testStandardDebugUnitTest with a dummy google-services.json setup.

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PR created automatically by Jules for task 4786848789865880393 started by @yuga-hashimoto

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