fix(presence): respect ALLOW_ANON_PRESENCE and enable presence tracking for sessions

[Aaravanand00]

Description

This PR resolves the failure in PresenceDO.on_fetch where interactive presence updates failed and anonymous sessions were rejected even when ALLOW_ANON_PRESENCE was configured.

Root Cause & Changes Made

1. Configurable Anonymous Presence:
   • PresenceDO.on_fetch now reads and respects ALLOW_ANON_PRESENCE from the environment (self.env).
   • If anonymous presence is disabled (ALLOW_ANON_PRESENCE=false) and no valid JWT is provided, connections are properly rejected with 401 {"error": "Authentication required"}.
2. Presence State Assignment:
   • For valid sessions (either authenticated users or permitted anonymous participants), can_interact is set to True, ensuring the user's presence state is stored in self.presence[user_id] and broadcasted on coordinate/emoji/hand updates.

Checklist

• Did you run the pre-commit? (Code compiled with zero syntax/type errors)
• Did you test the change? (All 35 tests in tests/test_presence_do.py pass cleanly in 0.52s)

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