refactor: Replace kwargs.pop with explicit resource_path keyword arguments

[vdusek]

Summary

• Replace the kwargs.pop('resource_path', ...) anti-pattern with proper keyword arguments in all resource client __init__ methods.
• Improves type safety, readability, and IDE support across 22 files (44 sync/async class pairs).
• Special handling for UserClient (resource_id: str | None = None, resolved to 'me') and RequestQueueClient (retains extra client_key param).

Test plan

• CI passes

🤖 Generated with Claude Code

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 96.62%. Comparing base (5ae33a0) to head (7dc2627).
⚠️ Report is 2 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #648      +/-   ##
==========================================
+ Coverage   96.59%   96.62%   +0.02%     
==========================================
  Files          46       46              
  Lines        4433     4383      -50     
==========================================
- Hits         4282     4235      -47     
+ Misses        151      148       -3     

Flag	Coverage Δ
integration	94.68% <100.00%> (+0.03%)	⬆️
unit	77.20% <58.13%> (+0.69%)	⬆️

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