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/reference/services/borgmatic.md

@@ -16,7 +16,7 @@ Daily backup system using Borg backup, running on indri.
 | **Install** | mise (pipx) |
 | **Config** | `~/.config/borgmatic/config.yaml` |
 | **Schedule** | Daily at 2:00 AM |
-| **Repository** | `/Volumes/backups/borg/` on [[Sifaka NAS|Sifaka]] |
+| **Repository** | `/Volumes/backups/borg/` on [[sifaka|Sifaka]] |
 
 ## What Gets Backed Up
 
@@ -55,6 +55,6 @@ Dashboard: "Borgmatic Backups" in [[grafana|Grafana]]
 
 ## Related
 
-- [[Backup Policy|Backups]] - Full backup policy
-- [[Sifaka NAS|Sifaka]] - Backup target
+- [[backups|Backups]] - Full backup policy
+- [[sifaka|Sifaka]] - Backup target
 - [[postgresql|PostgreSQL]] - Database backups