Pull the StartMigration -> Migrate -> FinishMigration orchestration out of
the v1 echo handlers into handler.RunFileMigration and csv.RunMigration so
the v2 API can reuse the exact same business logic. v1 is refactored onto
them and stays byte-identical on the wire.
Also tag the CSV detect/preview/config DTOs with doc:/enum: so they carry
descriptions in the v2 OpenAPI schema (ignored by v1 swaggo/xorm).
Add a new CSV migration module that allows users to import tasks from
any CSV file with custom column mapping and parsing options.
Backend changes:
- New CSV migrator module with detection, preview, and import endpoints
- Auto-detection of delimiter, quote character, and date format
- Suggested column mappings based on column name patterns
- Transactional import using InsertFromStructure
Frontend changes:
- New CSV migration UI with two-step flow (upload -> mapping -> import)
- Column mapping selectors for all task attributes
- Live preview showing first 5 tasks with current mapping
- Parsing option controls for delimiter and date format
The CSV migrator creates a parent "Imported from CSV" project with
child projects based on the project column if provided, or a default
"Tasks" project for tasks without a specified project.
kolaente
Claude