Add core database support and enhance documentation

- Introduced `MYSQL_CORE_DATABASE` in `.env.example` and `settings.py` for core database configuration.
- Added `CoreReadOnlyRepository` for read-only access to the `jinrong_core` database.
- Updated `AGENTS.md`, `README.md`, and various documentation files to reflect new agent onboarding processes and project structure.
- Revised requirements in `requirements.txt` to include `langgraph` and `langchain-core`.
- Enhanced `FLOW.md` with local bootstrap instructions for setting up the core simulation environment.
- Added new scripts for database creation and seeding for the core simulation library.
- Improved overall documentation for clarity on project architecture and memory management.
- Updated `TODO.md` to reflect current development priorities and tasks.

scripts/core/reset.ps1

@@ -0,0 +1,43 @@
+#Requires -Version 5.1
+<#
+.SYNOPSIS
+  重置 jinrong_core 模拟库并同步到 agent / Neo4j
+#>
+param(
+    [string]$MysqlUser = "root",
+    [string]$MysqlHost = "127.0.0.1",
+    [switch]$SkipNeo4j
+)
+
+$ErrorActionPreference = "Stop"
+$Root = Split-Path (Split-Path $PSScriptRoot -Parent) -Parent
+Set-Location $Root
+
+function Invoke-SqlFile($path) {
+    Write-Host ">> $path"
+    Get-Content -LiteralPath $path -Encoding UTF8 | mysql -h $MysqlHost -u $MysqlUser -p
+}
+
+Write-Host "=== Drop & recreate jinrong_core ==="
+mysql -h $MysqlHost -u $MysqlUser -p -e "DROP DATABASE IF EXISTS jinrong_core;"
+
+$files = @(
+    "scripts/core/00-create-database.sql",
+    "scripts/core/01-ddl.sql",
+    "scripts/core/02-seed-base.sql",
+    "scripts/core/03-seed-customers.sql",
+    "scripts/core/04-seed-holdings.sql",
+    "scripts/core/05-seed-trades.sql",
+    "scripts/core/06-seed-nav.sql"
+)
+foreach ($f in $files) { Invoke-SqlFile (Join-Path $Root $f) }
+
+Write-Host "=== Sync advisor rel ==="
+python scripts/sync/sync_advisor_rel.py
+
+if (-not $SkipNeo4j) {
+    Write-Host "=== Sync Neo4j ==="
+    python scripts/sync/sync_neo4j.py
+}
+
+Write-Host "Done."