Refactor NixOS integration to use pre-declared targets

Problem: Calling bild.run inside NixOS configs triggers recursive
builds during OS image creation, causing slow IFD evaluations that
worsen as complexity grows.

Solution: Create Biz/Targets.nix that pre-declares all buildable
targets as an attribute set. NixOS configs now import and reference
these targets directly, eliminating recursive builds during evaluation.

Changes: - Add Biz/Targets.nix exposing storybook, podcastitlater-web,
  podcastitlater-worker, dragons-analysis
- Update Biz.nix to import targets and reference them - Update
Biz/Dragons/Analysis.nix to use targets pattern

Benefits: - All bild.run calls happen once at top level during targets
evaluation - NixOS service configs reference pre-built derivations -
Scalable: adding targets doesn't slow individual builds - Explicit:
clear what gets built for each OS

Amp-Thread-ID:
https://ampcode.com/threads/T-bc0f6fc7-46bf-4aa2-892e-dd62e7251d4b
Co-authored-by: Amp <amp@ampcode.com>

0 files changed, 0 insertions, 0 deletions