new module structure

[raphael-goetz]

Resolves: #147

[Copilot]

Pull request overview

Implements the new “module” based definition layout (Issue #147) by changing the definition reader to load modules (with optional module.json) and updating the Aquila update service to send modules in a single request.

Changes:

• Replace per-definition-type Aquila updates (data types / functions / flow types) with a single module update call.
• Update the filesystem reader to discover module directories and load module-scoped definitions (including runtime flow types and configurations).
• Bump tucana dependency to 0.0.69 (and lockfile updates).

Reviewed changes

Copilot reviewed 4 out of 5 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
src/flow_service/mod.rs	Switches FlowUpdateService to read/send Module definitions via ModuleServiceClient.
src/flow_definition/mod.rs	Adds module discovery + loading (module.json, definition subdirs) and exposes read_modules().
src/flow_definition/feature/version.rs	Extends version filtering support to RuntimeFlowType.
Cargo.toml	Updates tucana dependency version.
Cargo.lock	Lockfile refresh for the dependency update.

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