Add SA Tools: BOM generator and AppCA export

- New tools/oci_bom_gen.py: generates .xlsx BOM from YAML spec with
    Oracle Redwood styling, Excel formulas, and Oracle disclaimer.
    Supports standard BOM (--output) and AppCA import format (--appca)
  - New tools/refresh_sku_catalog.py: refreshes SKU catalog prices from
    Oracle's public pricing API (apexapps.oracle.com)
  - New kb/pricing/oci-sku-catalog.yaml: ~160 OCI SKUs across 14
    categories, validated against Oracle API
  - New templates/bom-spec.yaml: input spec template for BOM generation
  - Add SA TOOLS section to SKILL.md (options 13-14)
  - Register BOM generator in oci_output.py

tools/oci_output.py

@@ -27,6 +27,7 @@ FORMATS = {
     "full": ["pptx", "drawio", "docx", "xlsx", "pdf"],
     "doc": ["docx"],
     "pdf": ["pdf"],
+    "bom": ["bom"],
 }
 
 GENERATORS = {
@@ -62,6 +63,13 @@ GENERATORS = {
         "method": "from_spec",
         "description": "Customer-facing PDF (.pdf)",
     },
+    "bom": {
+        "module": "oci_bom_gen",
+        "class": "OCIBomGenerator",
+        "method": "from_spec",
+        "description": "Bill of Materials (.xlsx)",
+        "optional": True,
+    },
 }