Add ERP order import endpoint and n8n order-ingest flow export

docs/README.md

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+# Docs Index
+
+This folder is the single home for project documentation.
+
+## Source Of Truth
+
+- `CONCEPT.md` is the normative source for product and system concepts.
+
+## Document Types
+
+- Normative: `CONCEPT.md`
+- Operational:
+  - `SPEC_PHASE1_COMPONENTS.md` (Komponenten-Spezifikation fuer Schritt 1)
+  - `PROCESS_PHASE1.md` (Ablauflogik fuer Import, Lager, Storno, Outbound-Webhook)
+- Derived:
+  - `SCHEMA_PHASE1.sql` (Draft schema for Schritt 1)
+  - `../db/migrations/*.sql` (Ausfuehrbare Datenbankmigrationen)
+- Historical: none yet
+- Legacy: none yet
+
+## How We Use This Folder
+
+- Keep the docs root small and scannable.
+- Add new operational docs only when there is a running process to describe.
+- If a file only repeats the concept, move it out of the active root or delete it.