chore: remove unused req_pool_timeout and req_connect_timeout configurations (#505)

Both configuration options were documented and included in the default config, but neither was being read or utilized anywhere in the application logic. This commit removes the dead code to prevent confusion.

Author: preciz

config/config.exs

@@ -91,8 +91,6 @@ config :llm_db,
 config :req_llm,
   receive_timeout: 120_000,
   stream_receive_timeout: 120_000,
-  req_connect_timeout: 60_000,
-  req_pool_timeout: 120_000,
   metadata_timeout: 120_000,
   thinking_timeout: 300_000
 

guides/configuration.md

@@ -10,8 +10,6 @@ config :req_llm,
   # HTTP timeouts (all values in milliseconds)
   receive_timeout: 120_000,          # Default response timeout
   stream_receive_timeout: 120_000,   # Streaming chunk timeout
-  req_connect_timeout: 60_000,       # TCP connection timeout
-  req_pool_timeout: 120_000,         # Connection pool checkout timeout
   metadata_timeout: 120_000,         # Streaming metadata collection timeout
   thinking_timeout: 300_000,         # Extended timeout for reasoning models
   image_receive_timeout: 120_000,    # Image generation timeout
@@ -76,22 +74,6 @@ Per-request override:
 ReqLLM.stream_text("anthropic:claude-haiku-4-5", "Hello", metadata_timeout: 60_000)
 ```
 
-### `req_connect_timeout` (default: 60,000ms)
-
-TCP connection establishment timeout.
-
-```elixir
-config :req_llm, req_connect_timeout: 30_000
-```
-
-### `req_pool_timeout` (default: 120,000ms)
-
-Maximum time to wait for a connection from the pool. Increase for high-concurrency scenarios.
-
-```elixir
-config :req_llm, req_pool_timeout: 180_000
-```
-
 ### `image_receive_timeout` (default: 120,000ms)
 
 Extended timeout specifically for image generation operations, which can take longer than text generation.