Write a SpacetimeDB backend module in Rust that defines one table and seeds one row.

TABLE
- primitive
  - Struct: Primitive
  - Fields:
    - id: u64 (primary key, auto_inc)
    - count: i32
    - total: i64
    - price: f32
    - ratio: f64
    - active: bool
    - name: String

REDUCERS
- seed: insert exactly this row into primitive (id is auto-assigned)
  - (count=2, total=3000000000, price=1.5, ratio=2.25, active=true, name="Alice")
