[auth] Add search-by-intent via ente-auth://search?query= deep link

[bekoeppel]

Description

• Support launching Ente Auth with a pre-filled search query via deep link, e.g. ente-auth://search?query=gmail
• Useful for automation tools (Tasker, shortcuts) to jump directly to a specific OTP code
• Fix deep link stream listener not being retained, so deep links now work when the app is already open

Tests

• Build and install the app
• adb shell am start -a android.intent.action.VIEW -d "ente-auth://search?query=gmail" with app closed: should open with search filtered
• Same command with app already open: should update the search
• adb shell am start -a android.intent.action.VIEW -d "ente-auth://abcd?query=gmail": should be ignored (only /search path is accepted)
• Verify existing otpauth:// deep links still work

[CLAassistant]

All committers have signed the CLA.

[chatgpt-codex-connector]

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Reviewed commit: 40332ed5f0

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[bekoeppel]

@codex review

[chatgpt-codex-connector]

💡 Codex Review

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Reviewed commit: 17ee46b060

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[bekoeppel]

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[chatgpt-codex-connector]

Codex Review: Didn't find any major issues. Bravo.

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[AmanRajSinghMourya]

@bekoeppel Thanks for the contribution but could you also add a video recording or a screenshot too.

[bekoeppel]

Hi @AmanRajSinghMourya! Sure, happy to. Here's a quick video how I intend to use this new intent (pun intended).

demo.mp4