feat: add caerphilly county borough council scraper

[InertiaUK]

Summary

• New scraper for Caerphilly County Borough Council (population ~181k, South Wales)
• Uses ReCollect API (area CaerphillyCountyUK, service 50008)
• Pure HTTP with requests - no Selenium needed
• 3-step flow: postcode suggest, place_calendar address picker, per-address events
• Caerphilly's ReCollect setup differs from other ReCollect councils - address-suggest returns postcode qualifiers only, so the scraper uses place_calendar's address picker (401 response containing address list) to resolve individual properties

Test plan

• Tested with CF83 1AP house 100 (Nantgarw Road) - Monday collections
• Also tested NP12 1AA house 1 - Thursday collections
• Returns Recycling (weekly), Food and Garden (weekly), Refuse (fortnightly)
• End-to-end verified through Kepthouse API

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 0f94660e-48b9-467c-9187-3bf6391eb300

📥 Commits

Reviewing files that changed from the base of the PR and between 8ecf878 and b59b0d2.

📒 Files selected for processing (2)

• uk_bin_collection/tests/input.json
• uk_bin_collection/uk_bin_collection/councils/CaerphillyCountyBoroughCouncil.py

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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[codecov]

❌ 1 Tests Failed:

Tests completed	Failed	Passed	Skipped
1	1	0	0

View the top 1 failed test(s) by shortest run time

::uk_bin_collection.tests.step_defs.test_validate_council

Stack Traces | 0s run time

.../tests/step_defs/test_validate_council.py:24: in <module>
    @pytest.fixture(params=get_council_list())
.../tests/step_defs/test_validate_council.py:19: in get_council_list
    data = json.load(file)
.../usr/lib/python3.12/json/__init__.py:293: in load
    return loads(fp.read(),
<frozen codecs>:322: in decode
    ???
E   UnicodeDecodeError: 'utf-8' codec can't decode byte 0x97 in position 41488: invalid start byte

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