refactor: implement full projects CRUD, move icons onto tag schema

- Remove priority field and sorting, switch to updated_at DESC
- Add icon field to tags table
- Split project description into name and short_description
- Implement full CRUD for projects (create, update, delete)
- Add admin stats endpoint (project counts by status)

migrations/20260107002857_refactor_projects_schema.sql

@@ -0,0 +1,9 @@
+-- Drop priority column and its index
+DROP INDEX IF EXISTS idx_projects_priority;
+ALTER TABLE projects DROP COLUMN priority;
+
+-- Rename title to name
+ALTER TABLE projects RENAME COLUMN title TO name;
+
+-- Add short_description field
+ALTER TABLE projects ADD COLUMN short_description TEXT NOT NULL DEFAULT '';

migrations/20260107004613_move_icons_to_tags.sql

@@ -0,0 +1,5 @@
+-- Add icon field to tags
+ALTER TABLE tags ADD COLUMN icon TEXT;
+
+-- Drop icon field from projects
+ALTER TABLE projects DROP COLUMN icon;