Fix wiki-links to use filename-based resolution (#90)

## Summary
- Quartz's "shortest" path mode resolves wiki-links by **filename**, not frontmatter title
- Previous PR used title-based links like `[[Grafana Alloy]]` which looked for non-existent `Grafana-Alloy.md`
- Now using filename-based links like `[[alloy|Grafana Alloy]]` which correctly resolve

## Changes
- Rename zk duplicate files with `-log` suffix (e.g., `argocd.md` → `argocd-log.md`)
- Rename `reference/storage/postgresql.md` to `postgresql-storage.md`
- Convert all 175 wiki-links from `[[Title]]` to `[[filename|Title]]` format
- Rename `doc-card-titles` task to `doc-filenames` (checks filename uniqueness, not titles)
- Update pre-commit hook for renamed task

## Deployment and Testing
- [x] Pre-commit hooks pass
- [x] `mise run doc-filenames` shows no duplicate filenames
- [ ] Verify wiki-links work correctly in Quartz build

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Reviewed-on: https://forge.ops.eblu.me/eblume/blumeops/pulls/90

docs/index.md

@@ -8,4 +8,4 @@ Welcome to the BlumeOps documentation.
 
 ## Sections
 
-- [[Reference]] - Technical reference cards for services, infrastructure, and operations
+- [[reference/index|Reference]] - Technical reference cards for services, infrastructure, and operations