Add CIDR range scanning support for proxy discovery

[Copilot]

• Initial CIDR range scanning implementation
• Add comprehensive unit tests for CIDR expansion
• Update documentation with CIDR examples
• Fix merge conflicts with main branch
• Remove unused imports and verify build
• Enhanced CIDR parsing to support non-newline-separated entries

The CIDR range scanning feature now supports various proxy entry formats including space-separated, comma-separated, and tab-separated entries on the same line. Previously, the parser only worked with newline-separated entries, but it now correctly identifies and expands CIDR ranges regardless of their position or surrounding text format.

The merge conflicts have been resolved and all tests are passing. The CIDR range scanning feature is now compatible with the latest main branch changes and handles real-world proxy source formats more effectively.

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[monosans]

@copilot fix merge conflicts

[Copilot]

@copilot fix merge conflicts

Merge conflicts fixed! The conflicts were in src/scraper.rs imports section and have been resolved. I also removed an unused import that was causing a build error. All tests are now passing and the code compiles successfully. Commit: 8b0e5be

[monosans]

@copilot proxies are not necessarily newline-separated

[Copilot]

@copilot proxies are not necessarily newline-separated

Fixed! The CIDR range parsing now handles various separators (spaces, commas, tabs) between proxy entries. Previously, the parser only worked with newline-separated entries, but now it correctly identifies and expands CIDR ranges regardless of their position or surrounding text format. Commit: 17d2849