feat: add southend-on-sea city council scraper

[InertiaUK]

Summary

• New scraper for Southend-on-Sea City Council (population ~183k, Essex)
• Uses Cloud9 Technologies open API at apps.cloud9technologies.com - same backend as the council's mobile app
• No authentication required, pure HTTP with requests - no Selenium needed
• Two API calls: address lookup by postcode, then waste collections by UPRN
• Returns up to 11 container types: Refuse Bin, Pink Lid Recycling Bin, Blue Lid Recycling Bin, Food Caddy, Garden Waste Sacks

Notes

• Council has no web-based bin day lookup (app-only), but the app's API is open
• SUEZ replaced Veolia as waste contractor April 2025, new bin scheme from October 2025

Test plan

• Tested with UPRN 010013362780 (1 Grovelands, SS2 4DU) - 4 bins
• Also tested UPRN 010013362781 (2 Grovelands) - 5 bins including garden waste
• End-to-end verified through Kepthouse API

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⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

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Run ID: 7f614ecf-6a4e-44b1-bad6-883c2a68d083

📥 Commits

Reviewing files that changed from the base of the PR and between 8ecf878 and 557951d.

📒 Files selected for processing (2)

• uk_bin_collection/tests/input.json
• uk_bin_collection/uk_bin_collection/councils/SouthendOnSeaCityCouncil.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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