[shared] Identify a Bedrock geography by the vendor that follows it

The cross-region inference-profile prefix was matched against a list of
four — us, eu, apac, global — so a profile issued under any other
geography kept its prefix through normalization. That form matches no
catalog key, which cost more than a blank price column:

  - discovery returned those models unpriced, so a real account's listing
    came back almost entirely at $0
  - the cost meter keys its table by the same normalized id, and operators
    are told to register a Bedrock id exactly as AWS issues it, region
    prefix included — so the default entry never resolved and every cache
    bucket, and any model priced only by catalog defaults, metered free

Identify the geography by what follows it instead: a leading segment is a
geography when a known Bedrock vendor namespace comes next. New
geographies then need no change at all, and a vendor missing from the map
fails safe by keeping the prefix — the behaviour of the list this
replaces. Over-stripping is the direction that must not happen, since the
normalized id also decides which route may claim a model.

Covered at all three seams the id passes through: the normalizer, the cost
meter config the proxy bills from, and the discovery listing the dashboard
renders. Each test fails against the old four-geography list.

shared/llm/model_test.go

@@ -60,3 +60,37 @@ func TestNormalizeAnthropicModel(t *testing.T) {
 		require.Equal(t, want, NormalizeAnthropicModel(in), "normalize %q", in)
 	}
 }
+
+// TestNormalizeBedrockModel_GeographiesBeyondTheOriginalFour covers the bug
+// that made this vendor-anchored: the geography used to be matched against a
+// list of four, so a profile issued anywhere else kept its prefix, missed the
+// catalog key it was supposed to match, and reported the model unpriced.
+func TestNormalizeBedrockModel_GeographiesBeyondTheOriginalFour(t *testing.T) {
+	for _, geo := range []string{"us", "eu", "apac", "global", "jp", "au", "ca", "sa", "us-gov", "il", "mx"} {
+		t.Run(geo, func(t *testing.T) {
+			got := NormalizeBedrockModel(geo + ".anthropic.claude-sonnet-5-20260514-v1:0")
+			require.Equal(t, "anthropic.claude-sonnet-5", got,
+				"a cross-region profile must reduce to the catalog key whatever geography issued it")
+		})
+	}
+}
+
+// TestNormalizeBedrockModel_KeepsAVendorItCannotMistakeForAGeography pins the
+// direction that must never break: a plain "<vendor>.<model>" id has no
+// geography, and cutting its first segment would strip the vendor away and
+// hand the id to whichever route claims the bare model name.
+func TestNormalizeBedrockModel_KeepsAVendorItCannotMistakeForAGeography(t *testing.T) {
+	cases := map[string]string{
+		"amazon.nova-pro-v1:0":             "amazon.nova-pro",
+		"anthropic.claude-sonnet-5-v1:0":   "anthropic.claude-sonnet-5",
+		"meta.llama3-3-70b-instruct-v1:0":  "meta.llama3-3-70b-instruct",
+		"cohere.command-r-plus-v1:0":       "cohere.command-r-plus",
+		"eu.unknownvendor.some-model-v1:0": "eu.unknownvendor.some-model",
+		"Qwen/Qwen2.5-0.5B-Instruct":       "Qwen/Qwen2.5-0.5B-Instruct",
+	}
+	for in, want := range cases {
+		t.Run(in, func(t *testing.T) {
+			require.Equal(t, want, NormalizeBedrockModel(in))
+		})
+	}
+}