Initial HerbAPI implementation

Rust/Axum REST API (herbapi-api) with PostgreSQL, S3/Garage, OIDC auth.
Dioxus 0.7 WASM frontend (herbapi-ui) with sidebar layout and botanical reference style.
9 SQL migrations covering families, species, cultivars, suppliers, companions, images, users, API tokens.

herbapi-api/migrations/006_create_suppliers.sql

@@ -0,0 +1,29 @@
+CREATE TABLE suppliers (
+    id          UUID PRIMARY KEY DEFAULT gen_random_uuid(),
+    slug        TEXT NOT NULL UNIQUE,
+    name        TEXT NOT NULL,
+    url         TEXT,
+    is_organic  BOOLEAN NOT NULL DEFAULT FALSE,
+    is_demeter  BOOLEAN NOT NULL DEFAULT FALSE,
+    country     TEXT,
+    notes       TEXT,
+    created_at  TIMESTAMPTZ NOT NULL DEFAULT NOW(),
+    updated_at  TIMESTAMPTZ NOT NULL DEFAULT NOW()
+);
+
+CREATE TABLE cultivar_suppliers (
+    id              UUID PRIMARY KEY DEFAULT gen_random_uuid(),
+    cultivar_id     UUID NOT NULL REFERENCES cultivars(id) ON DELETE CASCADE,
+    supplier_id     UUID NOT NULL REFERENCES suppliers(id) ON DELETE CASCADE,
+    article_number  TEXT,
+    product_url     TEXT,
+    price_eur       NUMERIC(8,2),
+    pack_size       NUMERIC(8,2),
+    pack_unit       TEXT,
+    last_checked_at TIMESTAMPTZ,
+    created_at      TIMESTAMPTZ NOT NULL DEFAULT NOW(),
+    UNIQUE(cultivar_id, supplier_id, article_number)
+);
+
+CREATE INDEX idx_cs_cultivar ON cultivar_suppliers(cultivar_id);
+CREATE INDEX idx_cs_supplier ON cultivar_suppliers(supplier_id);