refactor(api): use standalone graphon package (#34209)

Co-authored-by: autofix-ci[bot] <114827586+autofix-ci[bot]@users.noreply.github.com>

api/.importlinter

@@ -3,7 +3,6 @@ root_packages =
     core
     constants
     context
-    graphon
     configs
     controllers
     extensions
@@ -13,152 +12,3 @@ root_packages =
     tasks
     services
 include_external_packages = True
-
-[importlinter:contract:workflow]
-name = Workflow
-type=layers
-layers =
-    graph_engine
-    graph_events
-    graph
-    nodes
-    node_events
-    runtime
-    entities
-containers =
-    graphon
-ignore_imports =
-    graphon.nodes.base.node -> graphon.graph_events
-    graphon.nodes.iteration.iteration_node -> graphon.graph_events
-    graphon.nodes.loop.loop_node -> graphon.graph_events
-
-    graphon.nodes.iteration.iteration_node -> graphon.graph_engine
-    graphon.nodes.loop.loop_node -> graphon.graph_engine
-    # TODO(QuantumGhost): fix the import violation later
-    graphon.entities.pause_reason -> graphon.nodes.human_input.entities
-
-[importlinter:contract:workflow-external-imports]
-name = Workflow External Imports
-type = forbidden
-source_modules =
-    graphon
-forbidden_modules =
-    constants
-    configs
-    context
-    controllers
-    extensions
-    factories
-    libs
-    models
-    services
-    tasks
-    core.agent
-    core.app
-    core.base
-    core.callback_handler
-    core.datasource
-    core.db
-    core.entities
-    core.errors
-    core.extension
-    core.external_data_tool
-    core.file
-    core.helper
-    core.hosting_configuration
-    core.indexing_runner
-    core.llm_generator
-    core.logging
-    core.mcp
-    core.memory
-    core.moderation
-    core.ops
-    core.plugin
-    core.prompt
-    core.provider_manager
-    core.rag
-    core.repositories
-    core.schemas
-    core.tools
-    core.trigger
-    core.variables
-
-[importlinter:contract:workflow-third-party-imports]
-name = Workflow Third-Party Imports
-type = forbidden
-source_modules =
-    graphon
-forbidden_modules =
-    sqlalchemy
-
-[importlinter:contract:rsc]
-name = RSC
-type = layers
-layers =
-    graph_engine
-    response_coordinator
-containers =
-    graphon.graph_engine
-
-[importlinter:contract:worker]
-name = Worker
-type = layers
-layers =
-    graph_engine
-    worker
-containers =
-    graphon.graph_engine
-
-[importlinter:contract:graph-engine-architecture]
-name = Graph Engine Architecture
-type = layers
-layers =
-    graph_engine
-    orchestration
-    command_processing
-    event_management
-    error_handler
-    graph_traversal
-    graph_state_manager
-    worker_management
-    domain
-containers =
-    graphon.graph_engine
-
-[importlinter:contract:domain-isolation]
-name = Domain Model Isolation
-type = forbidden
-source_modules =
-    graphon.graph_engine.domain
-forbidden_modules =
-    graphon.graph_engine.worker_management
-    graphon.graph_engine.command_channels
-    graphon.graph_engine.layers
-    graphon.graph_engine.protocols
-
-[importlinter:contract:worker-management]
-name = Worker Management
-type = forbidden
-source_modules =
-    graphon.graph_engine.worker_management
-forbidden_modules =
-    graphon.graph_engine.orchestration
-    graphon.graph_engine.command_processing
-    graphon.graph_engine.event_management
-
-
-[importlinter:contract:graph-traversal-components]
-name = Graph Traversal Components
-type = layers
-layers =
-    edge_processor
-    skip_propagator
-containers =
-    graphon.graph_engine.graph_traversal
-
-[importlinter:contract:command-channels]
-name = Command Channels Independence
-type = independence
-modules =
-    graphon.graph_engine.command_channels.in_memory_channel
-    graphon.graph_engine.command_channels.redis_channel