fix/workdir config root

[ignacio-gradial]

Summary

• Fixes --workdir config resolution when config.toml lives at the project root (no supabase/ subdir).
• Ensures migrations and db.seed.sql_paths are resolved relative to that root config.

Changes

• Add SetSupabaseDirPath to update derived paths when the config root isn’t supabase/.
• In flags.LoadConfig, detect root config.toml and set paths before loading config.

Repro / Verification

# start
go run . start --workdir /Users/iguridi/supabase/repro2/apps/supabase
# reset
go run . db reset --workdir /Users/iguridi/supabase/repro2/apps/supabase --yes

Observed:

• Migration applied: Applying migration 20250101000000_init.sql...
• Seed applied: Seeding data from seed/base/01-seed.sql...

DB check:

select * from public.test_repro; -- returns 1 row

Closes #4784

[coveralls]

Pull Request Test Coverage Report for Build 21537450997

Details

• 5 of 40 (12.5%) changed or added relevant lines in 2 files are covered.
• 5 unchanged lines in 1 file lost coverage.
• Overall coverage decreased (-0.2%) to 55.323%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
internal/utils/flags/config_path.go	5	8	62.5%
internal/utils/misc.go	0	32	0.0%

Files with Coverage Reduction	New Missed Lines	%
internal/gen/keys/keys.go	5	12.9%

Totals
Change from base Build 21522313044:	-0.2%
Covered Lines:	7114
Relevant Lines:	12859

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💛 - Coveralls