feat(python): add HttpConfig transport configuration

[saie-ch]

Which issue does this PR address?

Relates to #2835.

Rationale

Python's HTTP transport was only reachable through the untested from_connection_string() path, with no config object like TCP got in #3776.

What changed?

Added HttpConfig, accepted by IggyClient.http(...), mirroring the TcpConfig pattern.

Local Execution

• Passed
• Pre-commit hooks ran

AI Usage

Claude Sonnet 5

[github-actions]

Thanks for the PR. It is labeled S-waiting-on-review and queued for review.

Slash commands (own line, regular comment) move it around the queue:

• /ready - back to S-waiting-on-review after addressing feedback
• /author - flip to S-waiting-on-author while you finish changes
• /request-review @user-or-team - request a reviewer

See CONTRIBUTING.md for details.

[codecov]

Codecov Report

❌ Patch coverage is 97.14286% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 84.93%. Comparing base (5916e6f) to head (2eaaada).
⚠️ Report is 4 commits behind head on master.

Files with missing lines	Patch %	Lines
foreign/python/src/config.rs	96.61%	2 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #3992      +/-   ##
============================================
+ Coverage     84.91%   84.93%   +0.02%     
  Complexity     1405     1405              
============================================
  Files          1224     1224              
  Lines        179301   179371      +70     
  Branches     145615   145614       -1     
============================================
+ Hits         152250   152350     +100     
+ Misses        23024    22974      -50     
- Partials       4027     4047      +20     

Components	Coverage Δ
Rust Core	85.80% <ø> (+<0.01%)	⬆️
Java SDK	67.35% <ø> (ø)
C# SDK	75.47% <ø> (+0.08%)	⬆️
Python SDK	90.27% <97.14%> (+0.20%)	⬆️
PHP SDK	85.65% <ø> (ø)
Node SDK	96.24% <ø> (+0.11%)	⬆️
Go SDK	69.29% <ø> (+0.03%)	⬆️

Files with missing lines	Coverage Δ
foreign/python/src/client.rs	99.85% <100.00%> (+<0.01%)	⬆️
foreign/python/src/lib.rs	100.00% <100.00%> (ø)
foreign/python/src/config.rs	96.93% <96.61%> (-0.10%)	⬇️

... and 44 files with indirect coverage changes

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[ethanlin01x]

I ran this locally and it works well. I have a few suggestions, mostly around tests and docs.

[ethanlin01x]

Nit: "stateless" is loose here - HttpClient does hold a JWT and swaps it on /users/refresh-token. It explains the missing reconnection policy fine, but not the missing auto-login. The second half of the sentence already gives the real reason, so dropping the first clause would be enough. Same in consumer.py and the README.

[saie-ch]

@ethanlin01x Could you please check now.

[slbotbm]

As was requested in the websocket pr: fold the http config example into existing examples as comments, and change the exposed API signature to IggyClient( ... | HttpConfig | ...).