Initial implementation of IRC LLM bot

Full implementation from spec: ZNC/IRC client with TLS, Ollama LLM backend,
per-user SQLite conversation memory, and Flask web admin portal with 7 pages.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

.env.example

@@ -0,0 +1,21 @@
+# ── ZNC ──────────────────────────────────────────
+ZNC_HOST=ham.activeblue.net
+ZNC_PORT=6501
+ZNC_USER=your_znc_username
+ZNC_PASSWORD=your_znc_password
+ZNC_SSL=true
+ZNC_NETWORK=activeblue
+
+# ── Bot Identity ──────────────────────────────────
+BOT_NICK=avcbot
+BOT_REALNAME=Active Blue IRC Bot
+
+# ── LLM Backend (startup defaults) ───────────────
+# config.json values override these at runtime
+OLLAMA_HOST=192.168.2.10
+OLLAMA_PORT=11434
+OLLAMA_MODEL=llama3.1
+
+# ── Web Portal ────────────────────────────────────
+PORTAL_PORT=8080
+PORTAL_SECRET_KEY=changeme_use_a_long_random_string