refactor(intake-email): mutualized intake-emails creation in drivers

[CorentinTh]

Preparation for OwlRelay integration

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PR Overview

This PR refactors the intake email creation process to support a mutualized driver-based approach and prepares the codebase for OwlRelay integration. Key changes include:

• Introducing a new "random-username" intake email driver with its configuration and factory.
• Updating the intake email services, repository, and use cases to use the driver's generated email address rather than relying on username extraction.
• Adjusting tests, types, routes, and client components to support the new email address generation approach.

Reviewed Changes

File	Description
apps/papra-server/src/modules/intake-emails/drivers/random-username/random-username.intake-email-driver.ts	Adds the new driver that generates an email address using a random human-readable ID.
apps/papra-server/src/modules/intake-emails/intake-emails.services.ts	Creates intake email services using the driver’s generateEmailAddress function.
apps/papra-server/src/modules/intake-emails/drivers/intake-emails.drivers.ts	Registers the new random username driver in the drivers mapping.
apps/papra-server/src/modules/intake-emails/drivers/random-username/random-username.intake-email-driver.config.ts	Provides configuration (domain) specific to the new driver.
apps/papra-server/src/modules/intake-emails/intake-emails.models.test.ts	Adds tests for the buildEmailAddress and parseEmailAddress utilities.
apps/papra-server/src/modules/intake-emails/drivers/intake-emails.drivers.models.ts	Updates driver models to integrate with the new intake email driver.
apps/papra-server/src/modules/intake-emails/intake-emails.models.ts	Moves email address utilities to a common module for reuse.
apps/papra-server/src/modules/intake-emails/intake-emails.repository.ts	Updates repository functions to handle the new emailAddress field and retrieval by email.
apps/papra-server/src/modules/intake-emails/intake-emails.config.ts	Enhances configuration to allow driver selection and passes specific driver config.
apps/papra-client/src/modules/intake-emails/pages/intake-emails.page.tsx	Updates client side display to use the new emailAddress field.
apps/papra-server/src/modules/intake-emails/intake-emails.usecases.ts	Refactors use cases to remove the username extraction logic and rely on the generated email address.
apps/papra-client/src/modules/intake-emails/intake-emails.types.ts	Updates the IntakeEmail type to include the emailAddress property.
apps/papra-server/src/modules/intake-emails/intake-emails.routes.ts	Adjusts API routes to use the new driver-based services for intake email creation.
apps/papra-client/src/modules/intake-emails/intake-emails.models.ts	Removes the obsolete formatIntakeEmail function in favor of using the emailAddress directly.

Copilot reviewed 19 out of 19 changed files in this pull request and generated no comments.

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