feat(schematic): expose justify directive on field labels via MCP

Add optional `justify` property to `fieldPositions` entries in
`edit_schematic_component` and to `set_schematic_component_property`.

Changes:
- `python/kicad_interface.py`: new `_set_justify_on_property()` helper
  that adds/replaces/removes the `(justify ...)` token inside a property's
  `(effects ...)` block. Passing "center" (the KiCad default) removes the
  directive entirely. Integrated into `_set_property_in_block()` (for the
  `properties` dict path) and into the `field_positions` loop in
  `_handle_edit_schematic_component()`. `_handle_set_schematic_component_property()`
  now forwards `justify` from params through to the spec dict.
  Also fixes pre-existing mypy type-ignore on `circle.radius` (kipy stub).
- `src/tools/schematic.ts`: extend the `fieldPositions` Zod schema to accept
  `justify?: string | string[]` (array form normalised to a space-separated
  string before the Python call). Add `justify?: string` to
  `set_schematic_component_property`.
- `python/commands/routing.py`: fix pre-existing mypy error — annotate `ex`
  and `ey` as `float` in `_point_to_segment_distance_nm`.
- `python/commands/pin_locator.py`: fix pre-existing mypy error — use explicit
  `str()` cast on `pin_data["number"]` before `dict.get()` call.
- `tests/test_schematic_field_justify.py`: 14 unit + integration tests
  covering add/replace/remove of the justify directive and backward
  compatibility (calls without justify leave existing directives untouched).

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

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