ISSUE-4341: Allow more legal Sub-GHz frequencies in Germany#4349

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herbenderbler wants to merge 2 commits intoflipperdevices:devfrom

herbenderbler:ISSUE-4341/german-sub-ghz

Commits on Mar 12, 2026

subghz: expand EU/RU allowed bands to 868.0-868.6 and 868.7-869.2
herbenderbler
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subghz_test: add 868MHz debug frequencies for new EU/RU band coverage
herbenderbler
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