[ISSUE-018] Custom Recipe Creation

## Phase 3: Recipe Management (Weeks 4-5)

### Description
Create recipe creation form
Implement ingredient input with dynamic fields
Add image picker for recipe photos
Create instruction step builder
Add nutrition info input (optional)

### Dependencies
- #006
- #013

### Can Work in Parallel With
- #016
- #017

No files or tests are named. Start by reviewing dependencies #006 and #013, then locate the recipe-management entry points and determine how the form, dynamic ingredients, image picker, instruction steps, and optional nutrition input fit together. Done means all listed recipe-creation features work together.

Written by the indexing model from the issue text.