Rename medcenter landings and add the revenue calculator

Rename the two medcenter landings to their audience names:
medcenter -> medcenterphysio, medcenterpersonal -> medcenterstart.

Alongside the rename:
- add a RevenueCalculator section to both landings;
- rework the copy and figures in src/data/content.ts;
- simplify the lead form: drop the "cabinet_state" and "profile"
  selects (along with SelectField and the matching fields in
  shared/lead.ts, lead-mapper.ts and amo-check.ts) and make
  company and email optional;
- add the legacy/new static prototypes for both landings;
- add pnpm-lock.yaml to medcenterstart (package-lock.json is still
  there too).

deploy/apps.conf and deploy/README.md still refer to the old
directory names and need a follow-up.

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

medcenterstart/public/favicon.svg

@@ -0,0 +1 @@
+<svg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 128 128'><rect width='128' height='128' rx='26' fill='#0A2540'/><path d='M35 28h33c21 0 36 14 36 35S89 99 68 99H35V28Zm17 17v37h15c11 0 19-8 19-19s-8-18-19-18H52Z' fill='#fff'/><circle cx='67' cy='63' r='6' fill='#00C4B4'/></svg>