feat(editor): per-field input/output ports + i18n tooltips + 4 jai_client patterns

Phase A of the per-field-output-ports roadmap.

FlowRunDriver gains optional moduleInfo(capability) hook
that returns a ModuleSpec carrying declared inputs +
outputs (each ModuleField has name, type, locale->
description map). Default returns null so legacy hosts
that didn't implement the hook keep compiling — the editor
falls back to YAML-reference-derived ports.

FlowCanvas caches ModuleSpec per step capability, kicked
off lazily on each build. When the spec lands, the canvas
rebuilds with:

- Per-field input ports on the LEFT (declared input names,
  in stable manifest order) — replaces the with_-keys-as-
  port-labels shape.
- Per-field output ports on the RIGHT — one anchor per
  declared output field. A flow like summarize that
  declares response/model_endpoint/model_name/model_digest
  now exposes four distinct anchors instead of fanning
  every downstream reference out of one collapsed point.
- Tooltips on each port label, picked from the field's
  description.<locale> with English fallback.

NodeGeometry refactored: heightFor(inputs, outputs) takes
max(inputs, outputs); outputPortY(index) for the new
multi-port output side; outputAnchorY() preserves the
legacy single-anchor fallback so edges still draw before
the spec resolves.

Edges + hit-tester now use _outputPortPosition(stepId,
fieldName: edge.fromField). Field index lookup falls
through to outputAnchorY when the spec isn't loaded yet.

Patterns: ported modern, classic, blueprint, minimal from
jai_client's CanvasPatternPainter. Dropdown now has seven
choices (dots, grid, modern, classic, blueprint, minimal,
blank).

Bumps fai_studio_flow_editor to 0.9.0.

Signed-off-by: flemming-it <sf@flemming.it>

pubspec.yaml

@@ -1,6 +1,6 @@
 name: fai_studio_flow_editor
 description: Swappable inline YAML editor for F∆I Studio flows.
-version: 0.8.0
+version: 0.9.0
 publish_to: 'none'
 repository: https://git.flemming.ai/fai/studio-flow-editor