Bring codebase into compliance with bible contracts (A–E)

A (hardware-ingest-json v2.8-2.9): remove sensor location fields from schema
and collector; tag HardwareMemory.Location as json:"-"; add PlatformConfig to
HardwareSnapshot.

B (no-hardcoded-vendors): consolidate PCI vendor IDs into collector/pci_vendors.go;
replace all vendor-name string checks in isGPUDevice, isNVIDIADevice, isMellanoxDevice,
isAMDGPUDevice, matchesGPUVendor (sat_overlay), and validateIsVendorGPU (page_validate)
with numeric vendor_id comparisons.

C (module-structure): split app/app.go (1413 lines) into app.go + app_format.go,
app_network.go, app_services.go, app_packs.go, app_install.go — no logic changes.

D (go-code-style): wrap bare return err in interfaceAdminState and
interfaceIPv4Addrs (platform/network.go) with fmt.Errorf context including
the interface name.

E (go-project-bible): add bible-local/architecture/data-model.md and
bible-local/architecture/api-surface.md.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

audit/internal/collector/nvidia.go

@@ -10,8 +10,6 @@ import (
 	"strings"
 )
 
-const nvidiaVendorID = 0x10de
-
 type nvidiaGPUInfo struct {
 	Index              int
 	BDF                string
@@ -240,13 +238,7 @@ func normalizePCIeBDF(bdf string) string {
 }
 
 func isNVIDIADevice(dev schema.HardwarePCIeDevice) bool {
-	if dev.VendorID != nil && *dev.VendorID == nvidiaVendorID {
-		return true
-	}
-	if dev.Manufacturer != nil && strings.Contains(strings.ToLower(*dev.Manufacturer), "nvidia") {
-		return true
-	}
-	return false
+	return dev.VendorID != nil && *dev.VendorID == NvidiaVendorID
 }
 
 func setPCIeFallback(dev *schema.HardwarePCIeDevice) {