feat(postcodes/ID): bulk-import 8,367 Indonesia postcodes via Pos Indonesia (#1039)

[dr5hn]

Summary

Adds 8,367 Indonesia postcodes spanning all 34 BPS provinces, sourced
from the MIT-licensed pentagonal/Indonesia-Postal-Code repository.

• Coverage: 100% province resolution (34/34 pre-2022 provinces).
• Granularity: city/regency level (one record per (postal_code, city));
  the source's 81,248 urban/sub-district rows collapse to 8,367 distinct
  codes when aggregated at the city level.

How it works

• The source rows carry a 2-digit BPS province code (11–92), mapped
  to CSC's states.json 2-letter iso2 via a hand-curated 34-entry table.
• Post-2022 Papua subdivisions (Papua Barat Daya, Pegunungan, Selatan,
  Tengah) do not yet appear in the source feed and are not surfaced
  in this import.

Source & licence

• Source URL: https://raw.githubusercontent.com/pentagonal/Indonesia-Postal-Code/master/Json/postal_array.json
• Licence: MIT (community redistribution of publicly published Pos
  Indonesia data).
• Each row: "source": "pos-indonesia-via-pentagonal"

Validation

• python3 -m py_compile clean.
• 100% of 8,367 codes match country.postal_code_regex (^(\d{5})$).
• 100% of records resolve a valid state_id whose country_id == 102
  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.

🤖 Generated with Claude Code

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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 8367 records. Large contributions require manual review.

Schema Validation (8367 records)

✅ All records passed validation

Cross-Reference Validation

✅ 16734 reference(s) verified

Source URL Verification

✅ 2 source URL(s) accessible

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✅ All checks passed | Status: Ready for review