chore: regenerate prices.json from models.dev (#27549)

Implements:
https://linear.app/codercom/issue/AIGOV-493/update-pricesjson-with-current-model-rates-before-cost-control-release

Run `make gen/aibridge-prices` to regenerate `prices.json` from
`models.dev`.

This update:
- adds support for the upstream `claude-opus-5` model;
- removes older `openai` models that have been removed upstream, keeping
us in sync with `models.dev`.

coderd/aibridge/prices/data/prices.json

@@ -87,6 +87,14 @@
     "cache_read_price": 500000,
     "cache_write_price": 6250000
   },
+  {
+    "provider": "anthropic",
+    "model": "claude-opus-5",
+    "input_price": 5000000,
+    "output_price": 25000000,
+    "cache_read_price": 500000,
+    "cache_write_price": 6250000
+  },
   {
     "provider": "anthropic",
     "model": "claude-sonnet-4-5",
@@ -215,22 +223,6 @@
     "cache_read_price": 125000,
     "cache_write_price": null
   },
-  {
-    "provider": "openai",
-    "model": "gpt-5-chat-latest",
-    "input_price": 1250000,
-    "output_price": 10000000,
-    "cache_read_price": 125000,
-    "cache_write_price": null
-  },
-  {
-    "provider": "openai",
-    "model": "gpt-5-codex",
-    "input_price": 1250000,
-    "output_price": 10000000,
-    "cache_read_price": 125000,
-    "cache_write_price": null
-  },
   {
     "provider": "openai",
     "model": "gpt-5-mini",
@@ -263,38 +255,6 @@
     "cache_read_price": 125000,
     "cache_write_price": null
   },
-  {
-    "provider": "openai",
-    "model": "gpt-5.1-chat-latest",
-    "input_price": 1250000,
-    "output_price": 10000000,
-    "cache_read_price": 125000,
-    "cache_write_price": null
-  },
-  {
-    "provider": "openai",
-    "model": "gpt-5.1-codex",
-    "input_price": 1250000,
-    "output_price": 10000000,
-    "cache_read_price": 125000,
-    "cache_write_price": null
-  },
-  {
-    "provider": "openai",
-    "model": "gpt-5.1-codex-max",
-    "input_price": 1250000,
-    "output_price": 10000000,
-    "cache_read_price": 125000,
-    "cache_write_price": null
-  },
-  {
-    "provider": "openai",
-    "model": "gpt-5.1-codex-mini",
-    "input_price": 250000,
-    "output_price": 2000000,
-    "cache_read_price": 25000,
-    "cache_write_price": null
-  },
   {
     "provider": "openai",
     "model": "gpt-5.2",
@@ -311,14 +271,6 @@
     "cache_read_price": 175000,
     "cache_write_price": null
   },
-  {
-    "provider": "openai",
-    "model": "gpt-5.2-codex",
-    "input_price": 1750000,
-    "output_price": 14000000,
-    "cache_read_price": 175000,
-    "cache_write_price": null
-  },
   {
     "provider": "openai",
     "model": "gpt-5.2-pro",
@@ -439,6 +391,14 @@
     "cache_read_price": 1250000,
     "cache_write_price": null
   },
+  {
+    "provider": "openai",
+    "model": "gpt-realtime-2.1",
+    "input_price": 4000000,
+    "output_price": 24000000,
+    "cache_read_price": 400000,
+    "cache_write_price": null
+  },
   {
     "provider": "openai",
     "model": "o1",
@@ -463,14 +423,6 @@
     "cache_read_price": 500000,
     "cache_write_price": null
   },
-  {
-    "provider": "openai",
-    "model": "o3-deep-research",
-    "input_price": 10000000,
-    "output_price": 40000000,
-    "cache_read_price": 2500000,
-    "cache_write_price": null
-  },
   {
     "provider": "openai",
     "model": "o3-mini",
@@ -495,14 +447,6 @@
     "cache_read_price": 275000,
     "cache_write_price": null
   },
-  {
-    "provider": "openai",
-    "model": "o4-mini-deep-research",
-    "input_price": 2000000,
-    "output_price": 8000000,
-    "cache_read_price": 500000,
-    "cache_write_price": null
-  },
   {
     "provider": "openai",
     "model": "text-embedding-3-large",