refactor: rename rewrite_max_tokens to rewrite_request_body

Rename local helper functions in providers with direct (non-factory)
implementations for consistency with the capability field name.

Author: nic-6443

apisix/plugins/ai-providers/aimlapi.lua

@@ -15,7 +15,7 @@
 -- limitations under the License.
 --
 
-local function rewrite_max_tokens(body, override, force)
+local function rewrite_request_body(body, override, force)
     if override.max_tokens then
         if force or body.max_tokens == nil then
             body.max_tokens = override.max_tokens
@@ -30,7 +30,7 @@ return require("apisix.plugins.ai-providers.base").new(
         capabilities = {
             ["openai-chat"] = {
                 path = "/chat/completions",
-                rewrite_request_body = rewrite_max_tokens,
+                rewrite_request_body = rewrite_request_body,
             },
         },
     }

apisix/plugins/ai-providers/anthropic.lua

@@ -15,7 +15,7 @@
 -- limitations under the License.
 --
 
-local function rewrite_max_tokens(body, override, force)
+local function rewrite_request_body(body, override, force)
     if override.max_tokens then
         if force or body.max_tokens == nil then
             body.max_tokens = override.max_tokens
@@ -30,11 +30,11 @@ return require("apisix.plugins.ai-providers.base").new(
         capabilities = {
             ["openai-chat"] = {
                 path = "/v1/chat/completions",
-                rewrite_request_body = rewrite_max_tokens,
+                rewrite_request_body = rewrite_request_body,
             },
             ["anthropic-messages"] = {
                 path = "/v1/messages",
-                rewrite_request_body = rewrite_max_tokens,
+                rewrite_request_body = rewrite_request_body,
             },
         },
     }

apisix/plugins/ai-providers/azure-openai.lua

@@ -15,7 +15,7 @@
 -- limitations under the License.
 --
 
-local function rewrite_max_tokens(body, override, force)
+local function rewrite_request_body(body, override, force)
     if override.max_tokens then
         if force or body.max_tokens == nil then
             body.max_tokens = override.max_tokens
@@ -30,7 +30,7 @@ return require("apisix.plugins.ai-providers.base").new(
         capabilities = {
             ["openai-chat"] = {
                 path = "/completions",
-                rewrite_request_body = rewrite_max_tokens,
+                rewrite_request_body = rewrite_request_body,
             },
         },
     }

apisix/plugins/ai-providers/deepseek.lua

@@ -15,7 +15,7 @@
 -- limitations under the License.
 --
 
-local function rewrite_max_tokens(body, override, force)
+local function rewrite_request_body(body, override, force)
     if override.max_tokens then
         if force or body.max_tokens == nil then
             body.max_tokens = override.max_tokens
@@ -30,7 +30,7 @@ return require("apisix.plugins.ai-providers.base").new(
         capabilities = {
             ["openai-chat"] = {
                 path = "/chat/completions",
-                rewrite_request_body = rewrite_max_tokens,
+                rewrite_request_body = rewrite_request_body,
             },
         },
     }

apisix/plugins/ai-providers/gemini.lua

@@ -15,7 +15,7 @@
 -- limitations under the License.
 --
 
-local function rewrite_max_tokens(body, override, force)
+local function rewrite_request_body(body, override, force)
     if override.max_tokens then
         if force or body.max_completion_tokens == nil then
             body.max_completion_tokens = override.max_tokens
@@ -30,7 +30,7 @@ return require("apisix.plugins.ai-providers.base").new(
         capabilities = {
             ["openai-chat"] = {
                 path = "/v1beta/openai/chat/completions",
-                rewrite_request_body = rewrite_max_tokens,
+                rewrite_request_body = rewrite_request_body,
             },
         },
     }

apisix/plugins/ai-providers/openrouter.lua

@@ -15,7 +15,7 @@
 -- limitations under the License.
 --
 
-local function rewrite_max_tokens(body, override, force)
+local function rewrite_request_body(body, override, force)
     if override.max_tokens then
         if force or body.max_tokens == nil then
             body.max_tokens = override.max_tokens
@@ -30,7 +30,7 @@ return require("apisix.plugins.ai-providers.base").new(
         capabilities = {
             ["openai-chat"] = {
                 path = "/api/v1/chat/completions",
-                rewrite_request_body = rewrite_max_tokens,
+                rewrite_request_body = rewrite_request_body,
             },
         },
     }

apisix/plugins/ai-providers/vertex-ai.lua

@@ -54,7 +54,7 @@ local function get_node(instance_conf)
 end
 
 
-local function rewrite_max_tokens(body, override, force)
+local function rewrite_request_body(body, override, force)
     if override.max_tokens then
         if force or body.max_completion_tokens == nil then
             body.max_completion_tokens = override.max_tokens
@@ -74,7 +74,7 @@ return require("apisix.plugins.ai-providers.base").new({
                     return get_chat_completions_path(conf.project_id, conf.region)
                 end
             end,
-            rewrite_request_body = rewrite_max_tokens,
+            rewrite_request_body = rewrite_request_body,
         },
         ["vertex-predict"] = {
             host = function(conf)