fix(telegram): bump MAX_COMMANDS_PER_SCOPE from 30 to 75

[eltecnicowd]

At 30, the BotCommand menu fills up with core commands and nothing else fits. Skills that register slash commands (like /buy, /kb, /micro) never show up in the Telegram menu because all 30 slots are taken by built-ins.

75 is enough breathing room for all built-in + plugin commands plus skill-derived ones. Still well within Telegram's own limit of 100.

[alt-glitch]

Duplicate of #33484 — both bump the hardcoded MAX_COMMANDS_PER_SCOPE constant in gateway/platforms/telegram.py to fix #33480 (#33484 raises it to 100, this PR to 75). Same site, same one-line constant-bump mechanism, just a different magnitude; #33484 (open, May 27) is the earlier submission. Related: #34147 and the configurable-cap cluster (#42021, #43162, #48903), which take the different approach of making the cap configurable rather than hardcoding a higher value.

[eltecnicowd]

Right — #33484 got there first with the same fix (30→100 vs our 30→75). And #48903 (configurable per-scope limit) is the better long-term approach anyway. Closing this in favor of those.

Note for reviewers: #33484's cap at 100 has a lower risk of hitting Telegram's 100 limit and matches the pattern in the earlier discussion.

[eltecnicowd]

Closing as duplicate of #33484.