fix: register storage engines for all CLI convert commands

[fank]

Summary

• Move engine registration from convertSingleFile() to the start of runConvert()
• Ensures engines are available for all convert subcommands (--all, --input, --status, --set-format)

Problem

Running ./app convert --all --format flatbuffers failed with:

Error converting ...: get storage engine: unknown storage engine: flatbuffers

The convertAll() code path was missing the engine registration that convertSingleFile() had.

Solution

Register engines once at the start of runConvert() after loading settings, following the pattern that whoever loads settings is responsible for registering engines:

• Server path: NewHandler() registers engines
• CLI path: runConvert() registers engines

Test plan

• go test ./... passes
• Verified convert tests cover both single file and batch conversion

[github-actions]

Merging this branch will decrease overall coverage

Impacted Packages	Coverage Δ	🤖
github.com/OCAP2/web/cmd/ocap-webserver	17.06% (-0.44%)	👎

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Coverage by file

Changed files (no unit tests)

Changed File	Coverage Δ	Total	Covered	Missed	🤖
github.com/OCAP2/web/cmd/ocap-webserver/main.go	17.06% (-0.44%)	586 (-8)	100 (-4)	486 (-4)	👎

Please note that the "Total", "Covered", and "Missed" counts above refer to code statements instead of lines of code. The value in brackets refers to the test coverage of that file in the old version of the code.