supabase / supabase-swift / 23296376626

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feat(storage): implement setHeader method on storage client (#910)

Adds a new `setHeader(name:value:)` method to `StorageApi` for setting
per-request HTTP headers on storage operations. This maintains parity
with supabase-js PR #2079.

Key behaviors:
- Creates a copy of headers to avoid mutating shared state
- Returns self for method chaining
- Each StorageFileApi instance maintains independent headers

Acceptance Criteria:
- [x] `setHeader(name:value:)` method implemented on storage base client
- [x] Headers are copied (not mutated) when setting
- [x] Method chaining supported
- [x] Unit tests cover happy path and edge cases

Linear: SDK-693

Co-authored-by: Claude Opus 4.5 <noreply@anthropic.com>

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