Remove fly_query_* and fly_trim_habitat — migrate to fresh

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Problem

fly_query_habitat(), fly_query_lakes(), and fly_trim_habitat() query bcfishpass/fwapg databases. These are spatial database functions that belong in fresh, not in an airphoto tool.

They also pull in DBI and RPostgres as Suggests dependencies that non-DB users don't need.

Proposed Solution

Remove:

• R/fly_query_habitat.R, R/fly_query_lakes.R, R/fly_trim_habitat.R
• tests/testthat/test-fly_query_habitat.R, tests/testthat/test-fly_query_lakes.R
• man/fly_query_habitat.Rd, man/fly_query_lakes.Rd, man/fly_trim_habitat.Rd
• DBI and RPostgres from DESCRIPTION Suggests
• skip_if_no_db() test helper
• CLAUDE.md reference to DB functions

Bump to v0.2.0 (breaking change — functions removed). Package is new (v0.1.3) and we are the only users. No deprecation cycle needed.

Not referenced in vignettes or README — clean removal.

Related

Functions should migrate to fresh where they fit alongside other FWA/bcfishpass query functions.