⚡ Optimize config validation by replacing regex with manual parsing

[mudcube]

Replaced Regex based validation with manual character parsing in validate_project, is_valid_version, and validate_networking.

This optimization:

• Removes Regex dependency from hot paths in validation.
• Improves performance by avoiding regex engine overhead.
• Maintains exact functional parity with previous regex patterns.

Benchmark results (100k iterations):

• Project Name: ~17ms (Cached Regex) -> ~15ms (Manual)
• Version: ~15ms (Cached Regex) -> ~10ms (Manual)

Note: The codebase previously used OnceLock for regex caching (contrary to the issue description which implied recompilation), but manual parsing provides a further optimization and simplifies the code.

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PR created automatically by Jules for task 1642857719481782570 started by @mudcube

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