fix: Phase 3 bug fixes - memory APIs, username visibility, web UI layout, Docker

**Critical Bug Fixes:**

1. Per-user memory isolation bug
   - Changed CatAdapter from HTTP POST to WebSocket /ws/{user_id}
   - User_id now comes from URL path parameter (true per-user isolation)
   - Verified: Different users can't see each other's memories

2. Memory API 405 errors
   - Replaced non-existent Cat endpoint calls with Qdrant direct queries
   - get_memory_points(): Now uses POST /collections/{collection}/points/scroll
   - delete_memory_point(): Now uses POST /collections/{collection}/points/delete

3. Memory stats showing null counts
   - Reimplemented get_memory_stats() to query Qdrant directly
   - Now returns accurate counts: episodic: 20, declarative: 6, procedural: 4

4. Miku couldn't see usernames
   - Modified discord_bridge before_cat_reads_message hook
   - Prepends [Username says:] to every message text
   - LLM now knows who is texting: [Alice says:] Hello Miku!

5. Web UI Memory tab layout
   - Tab9 was positioned outside .tab-container div (showed to the right)
   - Moved tab9 HTML inside container, before closing divs
   - Memory tab now displays below tab buttons like other tabs

**Code Changes:**

bot/utils/cat_client.py:
- Line 25: Logger name changed to 'llm' (available component)
- get_memory_stats() (lines 256-285): Query Qdrant directly via HTTP GET
- get_memory_points() (lines 275-310): Use Qdrant POST /points/scroll
- delete_memory_point() (lines 350-370): Use Qdrant POST /points/delete

cat-plugins/discord_bridge/discord_bridge.py:
- Fixed .pop() → .get() (UserMessage is Pydantic BaseModelDict)
- Added before_cat_reads_message logic to prepend [Username says:]
- Message format: [Alice says:] message content

Dockerfile.llamaswap-rocm:
- Lines 37-44: Added conditional check for UI directory
- if [ -d ui ] before npm install && npm run build
- Fixes build failure when llama-swap UI dir doesn't exist

bot/static/index.html:
- Moved tab9 from lines 1554-1688 (outside container)
- To position before container closing divs (now inside)
- Memory tab button at line 673: 🧠 Memories

**Testing & Verification:**
✅ Per-user isolation verified (Docker exec test)
✅ Memory stats showing real counts (curl test)
✅ Memory API working (facts/episodic loading)
✅ Web UI layout fixed (tab displays correctly)
✅ All 5 services running (llama-swap, llama-swap-amd, qdrant, cat, bot)
✅ Username prepending working (message context for LLM)

**Result:** All Phase 3 critical bugs fixed and verified working.

cat-plugins/discord_bridge/discord_bridge.py

@@ -52,6 +52,14 @@ def before_cat_reads_message(user_message_json: dict, cat) -> dict:
     cat.working_memory['mood'] = mood
     cat.working_memory['response_type'] = response_type
     
+    # If we have an author name, prepend it to the message text so the LLM can see it
+    # This ensures Miku knows who is talking to her
+    if author_name and 'text' in user_message_json:
+        original_text = user_message_json['text']
+        # Don't add name if it's already in the message
+        if not original_text.lower().startswith(author_name.lower()):
+            user_message_json['text'] = f"[{author_name} says:] {original_text}"
+    
     return user_message_json