Refactor duplicated test utilities and establish proc macro foundation for SQL deduplication

[Copilot]

Identified and began refactoring ~940 lines of duplicated code across test helpers and database repository implementations.

Changes

Test Utilities Consolidation ✅

• Extracted duplicated create_test_task() and create_test_robot() into admin/orchestrator/src/test_utils.rs
• Updated 3 test modules to import shared helpers
• Eliminated: 89 lines of duplicate code

SQL Repository Deduplication Foundation 🚧

Created proc_macros/ crate to generate repository implementations via derive macros instead of manual duplication across 5 schemas × 2 backends.

Target: ~850 lines of near-identical search(), count(), and list() implementations in:

• shared/src/schema/{entity,area,beacon,merchant,connection}.rs

Approach:

#[derive(SqlRepository)]
#[repo(
    table = "areas",
    search_fields = "name, description, beacon_code",
    has_entity = true
)]
pub struct Area { /* ... */ }

Generates both PostgreSQL (ILIKE, $N) and SQLite (COLLATE NOCASE, ?N) implementations at compile-time.

Status: Skeleton implemented, attribute parsing and code generation logic remains.

Stats

• Completed: 89 lines eliminated
• Projected: 850 lines when proc macro complete
• Net: 10 files changed, +280/-77 lines (infrastructure vs duplication)

Original prompt

Find and refactor duplicated code

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[7086cmd]

        // SQLite implementation with entity filter
        // (to be implemented similarly)

Implement it RIGHT AWAY.