Feature/delta team/epic r04 (#7)

## Summary

epic r04 - begin refactor

## Change Type

- [x] Cowork feature
- [ ] Bug fix
- [ ] Core AI contribution
- [ ] Test / hardening
- [ ] Performance
- [ ] Documentation

## Related Work

Cowork Task:

Core Repo: http://34.143.229.138/gitea-admin/fsg-ai-core-assets

Core AI Issue:

Core Task:

Related PR:

## Scope

What is intentionally included?

What is intentionally NOT included?

## Validation

- [ ] Unit tests
- [ ] Integration tests
- [ ] Manual verification
- [ ] Regression check

Commands / evidence:

## Security Impact

Permission / credential / network / customer data impact:

## Compatibility

- [ ] No breaking change
- [ ] Breaking change documented

## Reviewer Notes

Anything Cowork reviewers should pay attention to.

---------

Co-authored-by: Anh Tran Nguyen Minh <anhtnm1@fpt.com>
Co-authored-by: Huong Le Thi Thien <huongltt35@fpt.com>
Co-authored-by: Nam Pham Dinh Thanh <nampdt@fpt.com>
Co-authored-by: Vu Dam Tuan <vudt15@fpt.com>
Co-authored-by: Hiep Ha Van <hiephv3@fpt.com>
Co-authored-by: Lam Hoang Van <lamhv7@fpt.com>
Reviewed-on: #7
Co-authored-by: Duy Le Huu <duylh19@fpt.com>

providers/factory.py

@@ -1,25 +1,32 @@
-"""Build a provider instance from the application config."""
+"""Build a provider instance from the application config.
+
+Kept as the historic entry point (``providers.build_provider``) that call sites
+across the app already import, but it no longer owns a provider table of its
+own: since R03-T02 the catalogue lives in
+``infrastructure/providers/provider_registry.py`` so provider ids, wire
+protocols, default models and capabilities are declared exactly once.
+"""
 from __future__ import annotations
 
 from typing import Any, Dict
 
-from .anthropic import AnthropicProvider
 from .base import Provider, ProviderError
-from .openai_compat import OpenAICompatProvider
-
-_REGISTRY = {
-    "openai_compat": OpenAICompatProvider,
-    "anthropic": AnthropicProvider,
-    # All OpenAI-compatible endpoints (Ollama's /v1 server, the Copilot chat API,
-    # and OpenAI itself) speak the same Chat Completions protocol.
-    "ollama": OpenAICompatProvider,
-    "github_copilot": OpenAICompatProvider,
-    "codex": OpenAICompatProvider,
-}
 
 
 def build_provider(name: str, conf: Dict[str, Any]) -> Provider:
-    cls = _REGISTRY.get(name)
-    if cls is None:
-        raise ProviderError(f"Unsupported provider: {name}")
-    return cls(conf)
+    """Construct the adapter registered for ``name``.
+
+    Delegates to the central registry and translates its lookup failure into
+    :class:`ProviderError`, because every existing call site (chat turns,
+    Settings' connection test, the routing prober) already handles that type —
+    changing the exception would ripple into unrelated error handling.
+    """
+    from ..infrastructure.providers.provider_registry import (
+        ProviderNotFoundError,
+        default_registry,
+    )
+
+    try:
+        return default_registry().build(name, conf)
+    except ProviderNotFoundError as exc:
+        raise ProviderError(f"Unsupported provider: {name}") from exc