Infer reflected pin 1 orientations

[seveibar]

Summary

Follow-up to #714.

• infer pin 1's actual side from pin ordering, so corner pads distinguish cases such as leftside,top from topside,left
• evaluate all four rotations and their reflected equivalents, preferring a rotation and reflecting when the requested orientation implies reversed pin ordering
• transform reflected footprint geometry consistently, including pad/hole rotations, paths, polygons, text mirroring and anchor alignment, courtyards, and rectangular cutouts
• update the documentation to describe ordering-aware reflection inference

For example, DIP pin 1 at the upper-left is inferred as leftside,top because pin 2 continues downward. Requesting topside,left reflects the footprint so pin 2 continues rightward.

Validation

• bun test — 452 pass, 0 fail
• focused pin-location tests — 9 pass, 0 fail
• bun run build — ESM and DTS builds pass
• all eight orientations exercised across SOIC, DIP, QFP, crystal, SOT-23, BGA, passive, pin-row, and radial footprints
• Biome checks on changed files
• git diff --check