Add salary_cap column to Team model (v2.2.0)

- Add optional salary_cap (REAL/float) column to team table
- Create migration file for PostgreSQL schema change
- Update Peewee model with FloatField(null=True)

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

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

VERSION

@@ -1 +1 @@
-2.1.3
+2.2.0

app/db_engine.py

@@ -286,6 +286,7 @@ class Team(BaseModel):
     dice_color = CharField(null=True)
     season = IntegerField()
     auto_draft = BooleanField(null=True)
+    salary_cap = FloatField(null=True)
 
     @staticmethod
     def select_season(num):

migrations/2025-12-09_add_team_salary_cap.sql

@@ -0,0 +1,9 @@
+-- Migration: Add salary_cap column to teams table
+-- Date: 2025-12-09
+-- Description: Adds optional salary_cap column to track team salary cap values
+
+ALTER TABLE team
+ADD COLUMN IF NOT EXISTS salary_cap REAL;
+
+-- Note: REAL is PostgreSQL's single-precision floating-point type
+-- Column is nullable (no NOT NULL constraint) so existing rows get NULL