Initial release: Multi-provider AI chat with RAG

FastAPI backend (wiki-vector-chat.py) with Odysseus-style frontend.
Features: multi-provider LLM, Wiki KB + VectorDB RAG, session history,
chat modes, save-to-wiki, markdown rendering, SSE streaming.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

.gitignore

@@ -0,0 +1,18 @@
+# Secrets
+.wiki-api-token
+.htpasswd-wiki
+wiki-chat-providers.json
+
+# Data files
+wiki-kb.json
+vector-db/
+data/
+
+# Backups
+*.bak
+*.bak-zcode
+
+# Old wiki HTML (not part of this project)
+zai-ambassador-team-wiki-old.html
+zai-ambassador-team-wiki.html.bak
+zai-ambassadors-wiki.html