refactor(typing): Fixup typing A2 - workflow engine & nodes

[BeautyyuYanli]

Context

Part of #31680 (A2 stage: workflow engine & nodes).

What this PR does

Unblocks running ty on the workflow engine/nodes layer by tightening types, improving narrowing, and removing a few cross-layer import/typing issues.

Key changes:

• Typed workflow node config

  • Introduces core.workflow.entities.graph_config with NodeConfigDict + NodeConfigDictAdapter.
  • Updates workflow graph parsing (core.workflow.graph.graph.Graph) to validate node configs via Pydantic TypeAdapter and use typed indexing.
  • Updates Workflow.get_node_config_by_id() and workflow entry code to use the typed node config.

• Protocol-friendly dependency injection for HTTP request node

  • Adds thin adapters:
    • core.helper.ssrf_proxy.SSRFProxy implementing HttpClientProtocol
    • core.file.file_manager.FileManager implementing FileManagerProtocol
  • Updates HttpRequestNode / executor and DifyNodeFactory to accept optional injected deps with safe defaults (no behavioral change intended).

• Type/narrowing cleanups inside workflow code

  • Reduces cast() usage where types are already structurally guaranteed.
  • Improves runtime narrowing (isinstance) and a few small typing fixes in nodes (e.g. LLM prompt content handling, list operator file field extraction, datasource type conversion).

• Tooling

  • Bumps ty to >=0.0.14 and updates ty.toml rules/excludes for this stage.

Why

The workflow codebase has import-linter enforced layering, including that core.workflow.nodes.* must not import core.workflow.graph.*.

During the A2 work, models/workflow.py importing node-config typing from core.workflow.graph.graph created an indirect dependency chain that broke the rule once graph parsing started depending on node-typed configs.

Moving the shared node-config TypedDict into core.workflow.entities keeps the architecture boundary intact while still allowing Graph/Workflow/factories to share the same validated config shape.

Testing

• uv run --directory api --dev ty check
• uv run --directory api --dev lint-imports

[asukaminato0721]

https://typing.python.org/en/latest/spec/callables.html#unpack-kwargs

[BeautyyuYanli]

https://typing.python.org/en/latest/spec/callables.html#unpack-kwargs

Thx. Any is enough in this case