cleanup: drop dead upload.html + soften broker-only marketing copy

- Delete app/templates/upload.html. The /upload route redirected to
  /settings#import (302) and never rendered this template; the file
  was carrying stale Trading-212-only copy.
- Landing + pricing pages: replace "Trading 212 today, more brokers
  planned" with "Trading 212 natively, other formats auto-detected"
  to reflect the LLM-fallback parser that's been live for a few days.

The /upload redirect route in app/routers/pages.py stays — it remains
a useful bookmark-forwarder for users with old links.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

app/templates/pricing.html

@@ -62,7 +62,7 @@
       <li><strong>Strategic log refreshed every hour</strong> instead of every six &mdash; track intraday moves as they unfold</li>
       <li><strong>Follow-up chat on any past log</strong> &mdash; ask the model a question against the day&rsquo;s full context</li>
       <li><strong>Daily email digest</strong> (Mon&ndash;Sat) &mdash; ~600-word read of the session ahead, on top of the Sunday recap</li>
-      <li><strong>Portfolio import</strong> from a broker CSV (Trading 212 supported today; more brokers planned)</li>
+      <li><strong>Portfolio import</strong> from any broker CSV &mdash; Trading 212 natively, other formats auto-detected</li>
       <li><strong>AI portfolio read</strong> &mdash; diversification, sector and currency concentration, macro-regime fit on your holdings</li>
       <li><strong>Optional encrypted cloud sync</strong> &mdash; PIN-derived encryption in your browser, second-layer wrap on the server, no plaintext holdings server-side</li>
     </ul>