Add brain memory services and APIs

Introduce the backend pieces for brain memory ingestion, routing, and
system telemetry so the new knowledge workflows can project data into a
brain view. The supporting tests lock in the new behavior and keep the
expanded backend surface stable.

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

backend/.env.example

@@ -1,52 +1,24 @@
 # =============================================
-# Jarvis 后端配置
-# 复制此文件为 .env 并填入实际值
+# Jarvis 后端服务配置
+# 复制此文件为 .env 后按需修改
 # =============================================
 
 # === 应用基础 ===
 DEBUG=false
+HOST=127.0.0.1
+PORT=9527
 SECRET_KEY=change-me-to-a-random-secret-key
+CORS_ORIGINS=["http://localhost:5173","http://localhost:3000"]
 
-# === LLM 配置 ===
-# 支持: openai / claude / deepseek / ollama / custom
-LLM_PROVIDER=openai
+# === 数据存储 ===
+DATABASE_URL=sqlite+aiosqlite:///./data/jarvis.db
+DATA_DIR=./data
+CHROMA_PERSIST_DIR=./data/chroma
+UPLOAD_DIR=./data/uploads
+MAX_UPLOAD_SIZE=52428800
 
-# OpenAI（默认）
-OPENAI_API_KEY=your-openai-api-key-here
-OPENAI_MODEL=gpt-4o
-OPENAI_BASE_URL=https://api.openai.com/v1
-
-# Claude（可选）
-# ANTHROPIC_API_KEY=your-anthropic-api-key-here
-# CLAUDE_MODEL=claude-sonnet-4-20250514
-
-# DeepSeek（可选）
-# LLM_PROVIDER=deepseek
-# OPENAI_API_KEY=your-deepseek-api-key
-# OPENAI_BASE_URL=https://api.deepseek.com/v1
-
-# Ollama 本地模型（可选）
-# LLM_PROVIDER=ollama
-# OLLAMA_BASE_URL=http://localhost:11434
-# OLLAMA_MODEL=llama3
-
-# 自定义 OpenAI 兼容接口（可选）
-# LLM_PROVIDER=custom
-# OPENAI_API_KEY=your-api-key
-# OPENAI_BASE_URL=https://your-custom-endpoint/v1
-
-# === NAS 部署路径 ===
-NAS_DATA_ROOT=/data/jarvis
-DATA_DIR=/data/jarvis/data
-CHROMA_PERSIST_DIR=/data/jarvis/chroma
-UPLOAD_DIR=/data/jarvis/uploads
-
-
-# === LangSmith 可观测性 ===
-# 启用 LangSmith 追踪（可选）
-LANGSMITH_TRACING=false
-LANGSMITH_API_KEY=your-langsmith-api-key
-LANGSMITH_PROJECT=jarvis-agent
+# === JWT ===
+ACCESS_TOKEN_EXPIRE_MINUTES=1440
 
 # === 定时任务 ===
 SCHEDULER_ENABLED=true