[Backend] Remove unused sorobanWithdraw import in stream.controller.ts

[ogazboiz]

Telegram: https://t.me/+DOylgFv1jyJlNzM0

Why this matters

backend/src/controllers/stream.controller.ts imports withdraw as sorobanWithdraw from sorobanService (top of file) but never uses it — withdrawal has its own handler in routes/v1/streams/withdraw.ts. The dangling import is dead code and can trip no-unused-vars lint.

Acceptance criteria

• Remove withdraw as sorobanWithdraw from the import block in stream.controller.ts
• npm run build passes with no unused-import warning

Files to touch

• backend/src/controllers/stream.controller.ts

Out of scope

• The real withdraw handler in routes/v1/streams/withdraw.ts.

[frank0277]

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[devonahi]

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