remove the map and ui shim packages

Both failed the deletion test in the telling direction:

- @trails-cool/ui: Button/Input/Card had zero consumers — both apps
  roll their own elements inline. The only live part was a 6-line
  styles.css (the Tailwind entry + one keyframe), which now lives in
  each app as app/styles.css.
- @trails-cool/map: MapView and RouteLayer had zero consumers; the
  package was otherwise a re-export of two map-core constants, and the
  two import sites now use @trails-cool/map-core directly. The
  "map components go in @trails-cool/map" convention had drifted long
  ago — the real map components live in apps/planner/app/components.

CLAUDE.md's repository structure and conventions updated to match
reality (including pointing shared-type guidance at the post-#515
sources: db row types, api contracts, Waypoint in types). Dockerfiles
no longer COPY the deleted package manifests.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

packages/ui/package.json

@@ -1,16 +0,0 @@
-{
-  "name": "@trails-cool/ui",
-  "version": "0.0.1",
-  "type": "module",
-  "exports": {
-    ".": "./src/index.ts",
-    "./styles.css": "./src/styles.css"
-  },
-  "main": "./src/index.ts",
-  "types": "./src/index.ts",
-  "scripts": {
-    "test": "vitest run",
-    "lint": "eslint .",
-    "typecheck": "tsc"
-  }
-}