feat: initialize ERP base platform (extracted from HMS)

- Stripped 11 business crates (health, ai, dialysis, plugins)
- Cleaned AppState, AppConfig, main.rs from business coupling
- Reduced migrations from 169 to 53 (base-only)
- Removed health_provider trait from erp-core
- Removed business integration tests
- Removed gateway rate limiting middleware
- Base capabilities: auth, RBAC, JWT, config, workflow, message, plugin, audit, crypto, RLS, multi-tenant

Cargo check: OK
Cargo test: OK

Cargo.toml

@@ -0,0 +1,115 @@
+[workspace]
+resolver = "2"
+members = [
+    "crates/erp-core",
+    "crates/erp-server",
+    "crates/erp-auth",
+    "crates/erp-workflow",
+    "crates/erp-message",
+    "crates/erp-config",
+    "crates/erp-server/migration",
+    "crates/erp-plugin",
+]
+
+[workspace.package]
+version = "0.1.0"
+edition = "2024"
+license = "MIT"
+
+[workspace.dependencies]
+# Async
+tokio = { version = "1", features = ["full"] }
+
+# Web
+axum = { version = "0.8", features = ["multipart"] }
+tower = "0.5"
+tower-http = { version = "0.6", features = ["cors", "trace", "compression-gzip", "fs", "set-header"] }
+
+# Database
+sea-orm = { version = "1.1", features = [
+    "sqlx-postgres", "runtime-tokio-rustls", "macros", "with-uuid", "with-chrono", "with-json"
+] }
+sea-orm-migration = { version = "1.1", features = ["sqlx-postgres", "runtime-tokio-rustls"] }
+sqlx = { version = "0.8", features = ["runtime-tokio-rustls", "postgres", "uuid"] }
+
+# Serialization
+serde = { version = "1", features = ["derive"] }
+serde_json = "1"
+
+# UUID & Time
+uuid = { version = "1", features = ["v7", "serde"] }
+chrono = { version = "0.4", features = ["serde"] }
+
+# Error handling
+thiserror = "2"
+anyhow = "1"
+
+# Logging
+tracing = "0.1"
+tracing-subscriber = { version = "0.3", features = ["env-filter", "json"] }
+
+# Config
+config = "0.14"
+
+# Redis
+redis = { version = "0.27", features = ["tokio-comp", "connection-manager"] }
+
+# JWT
+jsonwebtoken = "9"
+
+# Password hashing
+argon2 = "0.5"
+
+# Cryptographic hashing (token storage)
+sha2 = "0.10"
+
+# API docs
+utoipa = { version = "5", features = ["axum_extras", "uuid", "chrono"] }
+# utoipa-swagger-ui 需要下载 GitHub 资源，网络受限时暂不使用
+# utoipa-swagger-ui = { version = "8", features = ["axum"] }
+
+# Validation
+validator = { version = "0.19", features = ["derive"] }
+
+# Async trait
+async-trait = "0.1"
+
+# HTTP client
+reqwest = { version = "0.12", features = ["json", "stream"] }
+
+# Crypto
+aes = "0.8"
+cbc = "0.1"
+hex = "0.4"
+regex-lite = "0.1"
+
+# CSV and Excel export
+csv = "1"
+rust_xlsxwriter = "0.82"
+
+# Internal crates
+erp-core = { path = "crates/erp-core" }
+erp-auth = { path = "crates/erp-auth" }
+erp-workflow = { path = "crates/erp-workflow" }
+erp-message = { path = "crates/erp-message" }
+erp-config = { path = "crates/erp-config" }
+erp-plugin = { path = "crates/erp-plugin" }
+
+# Async streaming
+futures = "0.3"
+tokio-stream = "0.1"
+async-stream = "0.3"
+dashmap = "6"
+
+# Template engine
+handlebars = "6"
+
+# HTML sanitization
+ammonia = "4"
+
+# Document parsing
+pdf-extract = "0.7"
+
+# Metrics
+metrics = "0.24"
+metrics-exporter-prometheus = "0.16"