feat(postcodes/MD): bulk-import 1,316 Moldova postcodes via Poșta Moldovei (#1039)

[dr5hn]

Summary

Adds 1,316 Moldova postcodes spanning 35 of 37 CSC raions/special
units, sourced from the vasilcovsky/moldova-geodata per-district
CSVs of the Poșta Moldovei catalogue.

• Coverage: 35/37 raions in the source; Bender and
  Basarabeasca are absent from the upstream feed and will be
  backfilled if a comprehensive source surfaces.
• Granularity: locality level — one record per
  (MD-prefixed code, locality) pair, plus centroid lat/lng.
• Format: codes are prefixed with the canonical MD- required
  by the country regex ^MD-\d{4}$.

Source & licence

• Source URL (file list): https://api.github.com/repos/vasilcovsky/moldova-geodata/contents/data
• Source URL (raw files): https://raw.githubusercontent.com/vasilcovsky/moldova-geodata/master/data/...
• Origin: Poșta Moldovei publicly published index, redistributed by
  vasilcovsky.
• Each row: "source": "posta-moldovei-via-vasilcovsky"

Validation

• python3 -m py_compile clean.
• 100% of 1,316 codes match country.postal_code_regex (^MD-\d{4}$).
• 100% of records resolve a valid state_id whose country_id == 144
  and whose iso2 matches state_code.
• No auto-managed fields (id, created_at, updated_at, flag).

Test plan

• Importer compiles and runs on a clean checkout.
• Cross-reference validator passes (regex + FK + state_code agreement).
• Idempotent merge verified.
• CI pipeline green.

Refs #1039.

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CSC Validation Report

PR Format

• ✅ Description provided
• ✅ Data source linked
• ✅ Issue linked (recommended for data changes)
• ✅ Justification / context provided

Labels applied: data:postcodes, large-contribution

⚠️ Large Contribution

This PR contains 1316 records. Large contributions require manual review.

Schema Validation (1316 records)

✅ All records passed validation

Cross-Reference Validation

✅ 2632 reference(s) verified

Geo-Bounds Check

• ⚠️ contributions/postcodes/MD.json: Record 274: coordinates (45.8458, 28.1947) fall outside MD bounds [46.32, 48.47] x [26.62, 30.13] (with 0.45deg tolerance)
• ⚠️ contributions/postcodes/MD.json: Record 280: coordinates (45.8631, 28.3006) fall outside MD bounds [46.32, 48.47] x [26.62, 30.13] (with 0.45deg tolerance)
• ⚠️ contributions/postcodes/MD.json: Record 281: coordinates (45.8561, 28.2917) fall outside MD bounds [46.32, 48.47] x [26.62, 30.13] (with 0.45deg tolerance)
• ⚠️ contributions/postcodes/MD.json: Record 717: coordinates (45.5992, 28.4494) fall outside MD bounds [46.32, 48.47] x [26.62, 30.13] (with 0.45deg tolerance)
• ⚠️ contributions/postcodes/MD.json: Record 718: coordinates (45.6778, 28.1742) fall outside MD bounds [46.32, 48.47] x [26.62, 30.13] (with 0.45deg tolerance)
• ⚠️ contributions/postcodes/MD.json: Record 719: coordinates (45.7581, 28.5069) fall outside MD bounds [46.32, 48.47] x [26.62, 30.13] (with 0.45deg tolerance)
• ⚠️ contributions/postcodes/MD.json: Record 720: coordinates (45.7217, 28.3917) fall outside MD bounds [46.32, 48.47] x [26.62, 30.13] (with 0.45deg tolerance)
• ⚠️ contributions/postcodes/MD.json: Record 721: coordinates (45.80667, 28.42778) fall outside MD bounds [46.32, 48.47] x [26.62, 30.13] (with 0.45deg tolerance)
• ⚠️ contributions/postcodes/MD.json: Record 722: coordinates (45.80667, 28.42778) fall outside MD bounds [46.32, 48.47] x [26.62, 30.13] (with 0.45deg tolerance)
• ⚠️ contributions/postcodes/MD.json: Record 723: coordinates (45.5378, 28.17) fall outside MD bounds [46.32, 48.47] x [26.62, 30.13] (with 0.45deg tolerance)

Source URL Verification

✅ 1 source URL(s) accessible

• ⚠️ Source URL unreachable: https://api.github.com/repos/vasilcovsky/moldova-geodata/contents/data (HTTP 403)
• ⚠️ Source URL unreachable: https://raw.githubusercontent.com/vasilcovsky/moldova-geodata/master/data/... (HTTP 404)

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✅ 0 errors, 29 warning(s) | Status: Ready for review (with warnings)