move tool definitions to agent-runtime

Moved backend/src/tools/definitions/ to packages/agent-runtime/src/tools/definitions/
Updated imports in backend to use @codebuff/agent-runtime
Converted internal agent-runtime imports to relative paths

🤖 Generated with Codebuff
Co-Authored-By: Codebuff <noreply@codebuff.com>

Author: charleslien

backend/src/tools/prompts.ts

@@ -4,7 +4,7 @@ import { buildArray } from '@codebuff/common/util/array'
 import { pluralize } from '@codebuff/common/util/string'
 import z from 'zod/v4'
 
-import { codebuffToolDefs } from './definitions/list'
+import { codebuffToolDefs } from '@codebuff/agent-runtime/tools/definitions/list'
 
 import type { ToolName } from '@codebuff/common/tools/constants'
 import type { customToolDefinitionsSchema } from '@codebuff/common/util/file'

backend/src/tools/tool-executor.ts

@@ -7,7 +7,7 @@ import { cloneDeep } from 'lodash'
 import z from 'zod/v4'
 import { convertJsonSchemaToZod } from 'zod-from-json-schema'
 
-import { codebuffToolDefs } from './definitions/list'
+import { codebuffToolDefs } from '@codebuff/agent-runtime/tools/definitions/list'
 import { codebuffToolHandlers } from './handlers/list'
 
 import type { AgentTemplate } from '@codebuff/agent-runtime/templates/types'

packages/agent-runtime/src/system-prompt/search-system-prompt.ts

@@ -1,7 +1,7 @@
 import {
   countTokens,
   countTokensJson,
-} from '@codebuff/agent-runtime/util/token-counter'
+} from '../util/token-counter'
 import { insertTrace } from '@codebuff/bigquery'
 import { buildArray } from '@codebuff/common/util/array'