Update duckhelp to send PM with detailed commands

MULTI_CHANNEL_PLAN.md

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+# Multi-Channel Support Implementation
+
+## What Multi-Channel Means
+- Players have **separate stats in each channel**
+- Nick "Bob" in #channel1 has different XP than "Bob" in #channel2
+- Database structure: `channels -> #channel1 -> players -> bob`
+
+## Changes Needed
+
+### 1. Database Structure (db.py)
+```python
+{
+  "channels": {
+    "#channel1": {
+      "players": {
+        "bob": { "xp": 100, ... },
+        "alice": { "xp": 50, ... }
+      }
+    },
+    "#channel2": {
+      "players": {
+        "bob": { "xp": 20, ... }  # Different stats!
+      }
+    }
+  }
+}
+```
+
+### 2. Database Methods
+- `get_player(nick, channel)` - Get player in specific channel
+- `get_players_for_channel(channel)` - Get all players in a channel
+- `iter_all_players()` - Iterate over all channels and players
+
+### 3. Command Changes (duckhuntbot.py)
+- Pass `channel` parameter when calling `db.get_player(nick, channel)`
+- Channel normalization (case-insensitive)
+
+### 4. Stats Commands
+- `!duckstats` shows stats for current channel
+- `!globalducks` shows combined stats across all channels
+
+## Benefits
+- Fair: Can't bring channel1 XP into channel2
+- Better: Each channel has own leaderboard
+- Clean: Stats don't mix between channels