feat: add count_for_filters and count methods via #[es_repo(count)]

[nicolasburtey]

Summary

Adds opt-in count attribute to the EsRepo derive macro. When #[es_repo(count)] is set, generates:

• count_for_filters(filters) -> Result<i64> — SELECT COUNT(*) with the same filter columns as list_for_filters
• count() -> Result<i64> — convenience wrapper calling count_for_filters(Default::default())

Also derives Clone on generated filter structs.

Usage

#[derive(EsRepo)]
#[es_repo(entity = "Customer", count, columns(...))]
pub struct CustomerRepo { pool: PgPool }

Companion PRs

• lana-bank: GaloyMoney/lana-bank#4658
• cala: feat: add count to TxTemplate and Transaction repos cala#705

🤖 Generated with Claude Code

[bodymindarts]

Blanket clone won’t work because we can’t garuantee all fields to be clone