Add Pause And Resume Support For Streams

[ritik4ever]

Problem:
Users can cancel streams permanently, but there is no way to pause and later resume a stream without losing its structure.

Scope:
Design and implement a pause/resume lifecycle across contract, backend, and UI.

Acceptance criteria:

• Streams can be paused and later resumed
• Vesting stops while paused
• Resume logic preserves fair accounting
• UI and history clearly show pause/resume transitions

[drips-wave]

This issue has been added to the Stellar Wave Program and is worth 200 Points.

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[cyber-excel10]

@cyber-excel10 has applied to work on this issue as part of the Stellar Wave Program's 3rd wave.

Hi, i do like to work on this issue .

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