fix(arweave_config_legacy): timeout during high load

[humaite]

This commit fixes a timeout on arweave_config_legacy when to many processes are trying to communicate with it. Instead of using messaging, a protected ETS table has been created, where the processes can directly fetch the configuration from it.

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[Copilot]

Pull request overview

This PR refactors the arweave_config_legacy module to fix timeout issues during high load by replacing synchronous gen_server:call messaging with direct ETS table reads for configuration access. The gen_server is still used for write operations, maintaining consistency while improving read performance.

Changes:

• Replaced gen_server state record with ETS table for storing configuration
• Modified read functions (get/0, get/1, has_key/1, get_env/0) to read directly from ETS instead of calling gen_server
• Updated all handle_call callbacks to use ETS instead of state record
• Added tests for unsupported message handlers

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 6 comments.

File	Description
apps/arweave_config/src/arweave_config_legacy.erl	Core refactoring from gen_server state to ETS-based storage; updated read/write operations
apps/arweave_config/test/arweave_config_legacy_SUITE.erl	Added tests for unsupported handler messages

Comments suppressed due to low confidence (1)

apps/arweave_config/src/arweave_config_legacy.erl:312

• The error list contains a duplicate entry for 'from'. Line 310 and line 312 both have {from, From}. This creates redundant information in the error log. Either remove one occurrence or replace the second one with a different field.

		{from, From},
		{message, Message},
		{from, From},

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