docs: migrate embedder→embedding_model and require vectordb across tool docs; add provider examples (en/ko/pt-BR) (#3804)

* docs(tools): migrate embedder->embedding_model, require vectordb; add Chroma/Qdrant examples across en/ko/pt-BR PDF/TXT/XML/MDX/DOCX/CSV/Directory docs

* docs(observability): apply latest Datadog tweaks in ko and pt-BR

docs/en/tools/file-document/pdfsearchtool.mdx

@@ -45,28 +45,64 @@ tool = PDFSearchTool(pdf='path/to/your/document.pdf')
 
 ## Custom model and embeddings
 
-By default, the tool uses OpenAI for both embeddings and summarization. To customize the model, you can use a config dictionary as follows:
+By default, the tool uses OpenAI for both embeddings and summarization. To customize the model, you can use a config dictionary as follows. Note: a vector database is required because generated embeddings must be stored and queried from a vectordb.
 
 ```python Code
+from crewai_tools import PDFSearchTool
+
+# - embedding_model (required): choose provider + provider-specific config
+# - vectordb (required): choose vector DB and pass its config
+
 tool = PDFSearchTool(
-    config=dict(
-        llm=dict(
-            provider="ollama", # or google, openai, anthropic, llama2, ...
-            config=dict(
-                model="llama2",
-                # temperature=0.5,
-                # top_p=1,
-                # stream=true,
-            ),
-        ),
-        embedder=dict(
-            provider="google", # or openai, ollama, ...
-            config=dict(
-                model="models/embedding-001",
-                task_type="retrieval_document",
-                # title="Embeddings",
-            ),
-        ),
-    )
+    config={
+        "embedding_model": {
+            # Supported providers: "openai", "azure", "google-generativeai", "google-vertex",
+            # "voyageai", "cohere", "huggingface", "jina", "sentence-transformer",
+            # "text2vec", "ollama", "openclip", "instructor", "onnx", "roboflow", "watsonx", "custom"
+            "provider": "openai",  # or: "google-generativeai", "cohere", "ollama", ...
+            "config": {
+                # Model identifier for the chosen provider. "model" will be auto-mapped to "model_name" internally.
+                "model": "text-embedding-3-small",
+                # Optional: API key. If omitted, the tool will use provider-specific env vars when available
+                # (e.g., OPENAI_API_KEY for provider="openai").
+                # "api_key": "sk-...",
+
+                # Provider-specific examples:
+                # --- Google Generative AI ---
+                # (Set provider="google-generativeai" above)
+                # "model": "models/embedding-001",
+                # "task_type": "retrieval_document",
+                # "title": "Embeddings",
+
+                # --- Cohere ---
+                # (Set provider="cohere" above)
+                # "model": "embed-english-v3.0",
+
+                # --- Ollama (local) ---
+                # (Set provider="ollama" above)
+                # "model": "nomic-embed-text",
+            },
+        },
+        "vectordb": {
+                    "provider": "chromadb",  # or "qdrant"
+                    "config": {
+                        # For ChromaDB: pass "settings" (chromadb.config.Settings) or rely on defaults.
+                        # Example (uncomment and import):
+                        # from chromadb.config import Settings
+                        # "settings": Settings(
+                        #     persist_directory="/content/chroma",
+                        #     allow_reset=True,
+                        #     is_persistent=True,
+                        # ),
+
+                        # For Qdrant: pass "vectors_config" (qdrant_client.models.VectorParams).
+                        # Example (uncomment and import):
+                        # from qdrant_client.models import VectorParams, Distance
+                        # "vectors_config": VectorParams(size=384, distance=Distance.COSINE),
+
+                        # Note: collection name is controlled by the tool (default: "rag_tool_collection"), not set here.
+                    }
+        },
+    }
 )
 ```