feat: local AI server scaffolding (FastAPI, RAG, embeddings). Port policy (>=26000), README/API docs, scripts.

scripts/dev_server.sh

@@ -0,0 +1,13 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+export OLLAMA_HOST=${OLLAMA_HOST:-http://localhost:11434}
+export BASE_MODEL=${BASE_MODEL:-qwen2.5:7b-instruct}
+export BOOST_MODEL=${BOOST_MODEL:-qwen2.5:14b-instruct}
+export EMBEDDING_MODEL=${EMBEDDING_MODEL:-nomic-embed-text}
+export INDEX_PATH=${INDEX_PATH:-data/index.jsonl}
+export AI_SERVER_PORT=${AI_SERVER_PORT:-26000}
+
+source .venv/bin/activate
+exec uvicorn server.main:app --host 0.0.0.0 --port "$AI_SERVER_PORT" --reload
+