Fix logs export/search: drop invalid tail=all from full_url

[kavehtoyser]

Problem

Exporting (or searching) logs in the new logs view saved a 150-byte JSON error instead of the log:

{"detail":[{"type":"int_parsing","loc":["query","tail"],"msg":"Input should be a valid integer, unable to parse string as an integer","input":"all"}]}

full_url was built with tail=all, but /services/~logs and /logs/stream type tail as Optional[int], so FastAPI 422s on "all". Both export and search fetch FULL_URL, so both were broken.

Fix

Omit tail from full_url. The endpoint then receives tail=None, and the runtime connector already maps a falsy tail to Docker's "all" (whole log) — see runtime_connectors.py "tail": tail if tail else "all".

• manager/routers/service_api.py — service log view full_url → base (no tail)
• manager/routers/logging_api.py — manager log view full_url → /logs/stream
• tests/manager_test/test_ui_redesign.py — guard tests previously asserted the buggy tail=all; now assert full_url carries no tail and tail=all is absent.

Verification

• tail=all → 422 (reproduced the bug); omitted/int tail → reaches handler (200).
• 17/17 test_ui_redesign.py pass; black ✓, flake8 ✓, pylint 10/10.

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