feat(terraphim_dsm): refactor to knowledge graph semantic grouping tool

[AlexMikhalev]

Summary

Refactors terraphim_dsm from a duplicate DSM analyzer into a sentrux companion tool focused on knowledge graph-based semantic module grouping.

Changes

• Deleted duplicate functionality: scanner.rs, metrics.rs, extractor.rs, output.rs
• Rewrote main.rs to accept module paths via stdin/file and group by KG concepts
• Simplified models.rs to semantic grouping types only
• Updated Cargo.toml: removed unnecessary deps, updated description
• Kept unique KG integration for domain concept matching and synonym support

Quality Gate

• sentrux score: 5243 (baseline: 5242) ✓
• All pre-commit checks pass ✓
• Tests: 3/3 pass ✓

Usage

# Group modules by KG concepts
cat modules.txt | terraphim_dsm

# Output JSON
cat modules.txt | terraphim_dsm --format json

# Filter by concept
cat modules.txt | terraphim_dsm --concept Authentication

Refs #1143 (Gitea)