• The third real PBC. Validates the modular-monolith template against a
    parent-with-children aggregate (Partner → Addresses → Contacts), where
    the previous two PBCs only had single-table or two-independent-table
    shapes.
    
    What landed
    -----------
    * New Gradle subproject `pbc/pbc-partners` (12 modules total now).
    * Three JPA entities, all extending `AuditedJpaEntity`:
      - `Partner` — code, name, type (CUSTOMER/SUPPLIER/BOTH), tax_id,
        website, email, phone, active, ext jsonb. Single-table for both
        customers and suppliers because the role flag is a property of
        the relationship, not the organisation.
      - `Address` — partner_id FK, address_type (BILLING/SHIPPING/OTHER),
        line1/line2/city/region/postal_code/country_code (ISO 3166-1),
        is_primary. Two free address lines + structured city/region/code
        is the smallest set that round-trips through every postal system.
      - `Contact` — partner_id FK, full_name, role, email, phone, active.
        PII-tagged in metadata YAML for the future audit/export tooling.
    * Spring Data JPA repos, application services with full CRUD and the
      invariants below, REST controllers under
      `/api/v1/partners/partners` (+ nested addresses, contacts).
    * `partners-init.xml` Liquibase changelog with the three tables, FKs,
      GIN index on `partner.ext`, indexes on type/active/country.
    * New api.v1 facade `org.vibeerp.api.v1.ext.partners` with
      `PartnersApi` + `PartnerRef`. Third `ext.<pbc>` after identity and
      catalog. Inactive partners hidden at the facade boundary.
    * `PartnersApiAdapter` runtime implementation in pbc-partners, never
      leaking JPA entity types.
    * `partners.yml` metadata declaring all 3 entities, 12 permission
      keys, 1 menu entry. Picked up automatically by `MetadataLoader`.
    * 15 new unit tests across `PartnerServiceTest`, `AddressServiceTest`
      and `ContactServiceTest` (mockk-based, mirroring catalog tests).
    
    Invariants enforced in code (not blindly delegated to the DB)
    -------------------------------------------------------------
    * Partner code uniqueness — explicit check produces a 400 with a real
      message instead of a 500 from the unique-index violation.
    * Partner code is NOT updatable — every external reference uses code,
      so renaming is a data-migration concern, not an API call.
    * Partner deactivate cascades to contacts (also flipped to inactive).
      Addresses are NOT touched (no `active` column — they exist or they
      don't). Verified end-to-end against Postgres.
    * "Primary" flag is at most one per (partner, address_type). When a
      new/updated address is marked primary, all OTHER primaries of the
      same type for the same partner are demoted in the same transaction.
    * Addresses and contacts reject operations on unknown partners
      up-front to give better errors than the FK-violation.
    
    End-to-end smoke test
    ---------------------
    Reset Postgres, booted the app, hit:
    * POST /api/v1/auth/login (admin) → JWT
    * POST /api/v1/partners/partners (CUSTOMER, SUPPLIER) → 201
    * GET  /api/v1/partners/partners → lists both
    * GET  /api/v1/partners/partners/by-code/CUST-ACME → resolves
    * POST /api/v1/partners/partners (dup code) → 400 with real message
    * POST .../{id}/addresses (BILLING, primary) → 201
    * POST .../{id}/contacts → 201
    * DELETE /api/v1/partners/partners/{id} → 204; partner active=false
    * GET  .../contacts → contact ALSO active=false (cascade verified)
    * GET  /api/v1/_meta/metadata/entities → 3 partners entities present
    * GET  /api/v1/_meta/metadata/permissions → 12 partners permissions
    * Regression: catalog UoMs/items, identity users, printing-shop
      plug-in plates all still HTTP 200.
    
    Build
    -----
    * `./gradlew build`: 12 subprojects, 107 unit tests, all green
      (was 11 / 92 before this commit).
    * The architectural rule still enforced: pbc-partners depends on
      api-v1 + platform-persistence + platform-security only — no
      cross-PBC dep, no platform-bootstrap dep.
    
    What was deferred
    -----------------
    * Permission enforcement on contact endpoints (P4.3). Currently plain
      authenticated; the metadata declares the planned `partners.contact.*`
      keys for when @RequirePermission lands.
    * Per-country address structure layered on top via metadata forms
      (P3.x). The current schema is the smallest universal subset.
    * `deletePartnerCompletely` — out of scope for v1; should be a
      separate "data scrub" admin tool, not a routine API call.
    zichun authored
     
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