* fix: pass recursionLimit to processStream in OpenAI-compatible agents API
The OpenAI-compatible endpoint never passed recursionLimit to LangGraph's
processStream(), silently capping all API-based agent calls at the default
25 steps. Mirror the 3-step cascade already used by the UI path (client.js):
yaml config default → per-agent DB override → max cap.
* refactor: extract resolveRecursionLimit into shared utility
Extract the 3-step recursion limit cascade into a shared
resolveRecursionLimit() function in @librechat/api. Both openai.js and
client.js now call this single source of truth.
Also fixes falsy-guard edge cases where recursion_limit=0 or
maxRecursionLimit=0 would silently misbehave, by using explicit
typeof + positive checks.
Includes unit tests covering all cascade branches and edge cases.
* refactor: use resolveRecursionLimit in openai.js and client.js
Replace duplicated cascade logic in both controllers with the shared
resolveRecursionLimit() utility from @librechat/api.
In openai.js: hoist agentsEConfig to avoid double property walk,
remove displaced comment, add integration test assertions.
In client.js: remove inline cascade that was overriding config
after initial assignment.
* fix: hoist processStream mock for test accessibility
The processStream mock was created inline inside mockResolvedValue,
making it inaccessible via createRun.mock.results (which returns
the Promise, not the resolved value). Hoist it to a module-level
variable so tests can assert on it directly.
* test: improve test isolation and boundary coverage
Use mockReturnValueOnce instead of mockReturnValue to prevent mock
leaking across test boundaries. Add boundary tests for downward
agent override and exact-match maxRecursionLimit.
* chore: linting for `loadCustomConfig`
* refactor: decouple CDN init and variable/health checks from AppService
* refactor: move AppService to packages/data-schemas
* chore: update AppConfig import path to use data-schemas
* chore: update JsonSchemaType import path to use data-schemas
* refactor: update UserController to import webSearchKeys and redefine FunctionTool typedef
* chore: remove AppService.js
* refactor: update AppConfig interface to use Partial<TCustomConfig> and make paths and fileStrategies optional
* refactor: update checkConfig function to accept Partial<TCustomConfig>
* chore: fix types
* refactor: move handleRateLimits to startup checks as is an effect
* test: remove outdated rate limit tests from AppService.spec and add new handleRateLimits tests in checks.spec
