feat(import): rework invoice ingestion end-to-end

[Ngob]

Replace the ad-hoc parser with a client-driven ingestion pipeline:

• invoice:import <client> <path> ingests all-or-nothing, journals every attempt with a four-state status, and stays idempotent on client+file+hash.
• Decoding goes through symfony/serializer behind per-format FormatStrategy (explicit or auto-detected) and per-shape MappingStrategy, ending at DTOs.
• Rows are validated by the Symfony Validator; amounts are checked on the literal so NUMERIC(19,4) can't silently rewrite them.
• Fixed SQL Injection
• Allow adding a client from YAML
• Prevent importing the same file more than once
• Corrected update into insert (so lines are inserted)
• Preventing update when multiple row with same "name" are in the files
• Add a "client", so invoices can be from multiple different emitters

If I had more time, I would:

• change the import architecture to an event driven one
• Allow the mangement of clients inside the database