Support full string ids

[konard]

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This pull request implements full string ID support as requested in issue #11.

📋 Issue Reference

Fixes #11

✅ Implementation Details

Core Enhancement:

• Enhanced TryParseLinkId function to support string aliases alongside existing numeric ID parsing
• Added overloaded version that uses NamedLinksDecorator for alias resolution
• Updated all parser calls in AdvancedMixedQueryProcessor to use the new string-aware parsing

Key Features:

• String Aliases as IDs: Users can now use string identifiers like person, name, value instead of numeric IDs
• Automatic ID Mapping: String aliases are automatically mapped to internal numeric link IDs when creating new links
• Backward Compatibility: All existing numeric ID functionality continues to work unchanged
• Key-Value Store: Effectively provides Redis-like key-value store functionality using string aliases

Example Usage:

# Create links with string IDs
clink '(() ((person: name john)))' --after
# Output: (name: name name), (john: john john), (person: name john)

# Query using string IDs  
clink '((($id: name $value)) (($id: name $value)))' --changes
# Output: Shows all name-value pairs using string identifiers

# Mixed numeric and string IDs work together
clink '(() ((1: person address) (location: 2 city)))' --after

🧪 Testing

• 124/124 tests pass - Full backward compatibility maintained
• Comprehensive string ID tests already exist in the test suite
• Manual CLI testing confirms string ID functionality works end-to-end

🏗️ Architecture

The implementation leverages the existing NamedLinksDecorator infrastructure:

• String aliases are stored in separate .names.links file alongside main database
• Namify() function in Program.cs already converts numeric IDs back to names in output
• No breaking changes to existing APIs or data formats

This provides the key-value store functionality requested in the issue, where string aliases effectively serve as keys that map to link relationships, giving users a Redis-like interface for link manipulation.

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