Fix city assignments: Move 130 Irkutsk Oblast cities from Sevastopol to correct state

[Copilot]

Problem

The database contained a critical geographic assignment error affecting 130 cities in Russia:

• Sevastopol municipality (Ukraine, state_id 1912) incorrectly contained 147 cities instead of ~17
• Irkutsk Oblast (Russia, state_id 1880) showed 0 cities when it should contain ~130 cities including major Siberian cities

Cities like Irkutsk, Angarsk, Bratsk, and Bodaybo were wrongly assigned to Sevastopol municipality in Ukraine instead of Irkutsk Oblast in Russia.

Root Cause

130 cities from Irkutsk Oblast (Siberian Russia, latitude 50-61°N) were incorrectly assigned with:

• state_id: 1912 (Sevastopol, Ukraine)
• country_id: 230 (Ukraine)
• country_code: "UA"
• state_code: "40"

Solution

This PR corrects the geographic assignments by:

1. Identifying misplaced cities using geographic coordinates (latitude >= 46°N indicated Siberian cities, not Crimean)
2. Updating 130 cities with correct attributes:
   • state_id: 1912 → 1880 (Sevastopol → Irkutsk Oblast)
   • country_id: 230 → 182 (Ukraine → Russia)
   • country_code: "UA" → "RU"
   • state_code: "40" → "IRK"
3. Moving cities from contributions/cities/UA.json to contributions/cities/RU.json

Changes

contributions/cities/RU.json:

• Added 130 Irkutsk Oblast cities
• Total: 5,393 → 5,523 cities (+130)

contributions/cities/UA.json:

• Removed 130 misassigned Irkutsk cities
• Total: 1,949 → 1,819 cities (-130)

Verification

✅ Sevastopol (state_id 1912): Now contains 17 cities

• Geographic range: 44.4°N - 44.8°N (Crimean Peninsula)
• Includes: Sevastopol, Balaklava, Inkerman, and proper districts
• All correctly assigned to Ukraine (UA)

✅ Irkutsk Oblast (state_id 1880): Now contains 130 cities

• Geographic range: 51.5°N - 61.3°N (Siberian Russia)
• Includes: Irkutsk (capital), Angarsk, Bratsk, Bodaybo, Ust-Ilimsk
• All correctly assigned to Russia (RU)

Fixes issue where Sevastopol municipality contained cities from Irkutsk oblast, and Irkutsk showed as a municipality without cities.

Original prompt

---

This section details on the original issue you should resolve

<issue_title>Sevastopol municipality contains cities and districts from Irkutsk oblast. The city of Irkutsk showed as a municipality without any cities</issue_title>
<issue_description>Sevastopol municipality contains cities and districts from Irkutsk oblast.
Sevastopol is municipality and should contain only Sevastopol city

The city of Irkutsk showed as a municipality without any cities
Irkutsk is the capital of Irkutsk oblast and contains a lot of towns(currently they are in Sevastopol municipality )</issue_description>

Comments on the Issue (you are @copilot in this section)

Fixes #706

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[dr5hn]

@copilot I've resolved conflicts, can you please take a look if the issue we fixed all the data is in correct place?

[Copilot]

@copilot I've resolved conflicts, can you please take a look if the issue we fixed all the data is in correct place?

Yes, I've verified all data is in the correct place after the conflict resolution. ✅

Verification Results:

City Counts:

• Sevastopol (state_id 1912): 17 cities ✓
• Irkutsk Oblast (state_id 1880): 130 cities ✓

Geographic Distribution:

• Sevastopol cities: 44.4°N - 44.8°N (Crimean Peninsula) ✓
• Irkutsk Oblast cities: 51.5°N - 61.3°N (Siberian Russia) ✓

Key Cities Verified:

• Sevastopol city → correctly in state_id 1912 (Ukraine)
• Irkutsk city → correctly in state_id 1880 (Russia)
• Angarsk, Bratsk, Bodaybo → all correctly in Irkutsk Oblast (Russia)

Data Integrity:

• Zero cities with mismatched country codes ✓
• No geographic anomalies (no high-latitude cities in Sevastopol, no low-latitude cities in Irkutsk) ✓

The fix survived the merge successfully. All 130 Irkutsk Oblast cities remain correctly assigned to Russia, and Sevastopol contains only its 17 proper cities/districts from Crimea.