feat: selectable wire format — ollama (default), openai (vLLM etc.), anthropic

Port the multi-API client from llm.chat (llm.rs kept in lockstep):
the optional api input selects the dialect, default stays the
unchanged v0.1.x Ollama behavior. openai covers vLLM, LM Studio,
LiteLLM and cloud OpenAI; api-specific error hints; api_key sent
as Bearer (ollama/openai) or x-api-key (anthropic). model_digest
stays an Ollama-only best-effort probe and is documented as such.

Proven end-to-end against a hermetic OpenAI-wire fake (request
shape validated, response parsed) via a hub flow run.

Signed-off-by: flemming-it <sf@flemming.it>

module.yaml

@@ -1,12 +1,12 @@
 schema_version: 3
 provider: chain
 name: text-summarize
-version: 0.1.0
+version: 0.2.0
 
 # Capability provided by this module.
 provides:
   - capability: text.summarize
-    version: 0.1.0
+    version: 0.2.0
 
 # Inputs the invoke function accepts.
 inputs:
@@ -38,8 +38,27 @@ inputs:
   endpoint:
     type: text
     description:
-      en: Ollama-shaped /api/chat endpoint.
-      de: Ollama-kompatibler /api/chat-Endpunkt.
+      en: |
+        Chat endpoint URL matching the selected api:
+        ollama "http://localhost:11434/api/chat",
+        openai "http://localhost:8000/v1/chat/completions"
+        (vLLM etc.), anthropic "https://.../v1/messages".
+      de: |
+        Chat-Endpunkt-URL passend zum gewählten api:
+        ollama "http://localhost:11434/api/chat",
+        openai "http://localhost:8000/v1/chat/completions"
+        (vLLM u. a.), anthropic "https://.../v1/messages".
+  api:
+    type: text
+    description:
+      en: |
+        Optional wire format: "ollama" (default), "openai"
+        (OpenAI-compatible servers such as vLLM or LM Studio),
+        or "anthropic" (Messages API). Empty = ollama.
+      de: |
+        Optionales Wire-Format: "ollama" (Default), "openai"
+        (OpenAI-kompatible Server wie vLLM oder LM Studio)
+        oder "anthropic" (Messages API). Leer = ollama.
   model:
     type: text
     description:
@@ -81,8 +100,14 @@ outputs:
   model_digest:
     type: text
     description:
-      en: SHA-256 digest of the served Ollama model (when reachable).
-      de: SHA-256-Digest des bedienten Ollama-Modells (wenn erreichbar).
+      en: |
+        SHA-256 digest of the served model, best-effort probe.
+        Ollama only — empty for other endpoints (OpenAI / vLLM /
+        Anthropic expose no digest API).
+      de: |
+        SHA-256-Digest des bedienten Modells (Best-Effort-Probe).
+        Nur bei Ollama — leer bei anderen Endpunkten (OpenAI /
+        vLLM / Anthropic bieten keine Digest-API).
 
 # Permissions required.
 permissions: