remove dead Milkomeda RPC logic from config, chain definitions, and error handling

[aniket866]

Closes #74

Summary by CodeRabbit

Chores

• Removed Milkomeda Mainnet blockchain support, including network configuration, chain definitions, and error handling mappings.

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[coderabbitai]

📝 Walkthrough

Walkthrough

This pull request removes all Milkomeda network support from the StablePay SDK. Changes include removing the chain definition, configuration entry, and URI mappings across the codebase, effectively deprecating Milkomeda as a supported network.

Changes

Cohort / File(s)	Summary
Network Configuration stablepay-sdk/src/contexts/chains.js, stablepay-sdk/src/utils/config.js	Removed Milkomeda chain definition, network configuration block, and network key mappings from getChainByNetworkKey and getChainConfigForWallet functions.
Error Handling stablepay-sdk/src/core/Transaction.js	Removed Milkomeda-specific URI mappings from error-handling branches, affecting network name resolution in contract initialization and connection error paths.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~10 minutes

Possibly related PRs

• fix: resolve network selection bug - use selected network instead of hardcoded mordor. #38: Added the Milkomeda network definitions, chain mappings, and configuration entries that are now being removed in this PR.

Suggested reviewers

• Zahnentferner

Poem

🐰 Milkomeda fades to memory's shore,
Chain definitions vanish evermore,
Config entries swept clean away,
The SDK's simpler from this day! 🌙

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title accurately reflects the main changeset, which removes Milkomeda-related RPC logic from multiple files including config, chain definitions, and error handling.
Linked Issues check	✅ Passed	The PR fully addresses issue #74 by removing all Milkomeda entries from configuration files and related chain/error-handling logic throughout the codebase.
Out of Scope Changes check	✅ Passed	All changes are directly related to the linked issue #74 objective of removing Milkomeda from configuration and related files; no out-of-scope modifications are present.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

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✨ Finishing touches

• 📝 Generate docstrings

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment

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