README: Replace --threads with real cobra concurrency flags

Docs sync: align README with current install/CLI behavior.

Co-authored-by: s1d3sw1ped_bot <s1d3sw1ped+giteabot@gmail.com>
Co-committed-by: s1d3sw1ped_bot <s1d3sw1ped+giteabot@gmail.com>

README.md

@@ -160,8 +160,9 @@ While most configuration is done via the YAML file, some runtime options are sti
 # Set logging level
 ./steamcache2 --log-level debug --log-format json
 
-# Set number of worker threads
-./steamcache2 --threads 8
+# Override concurrency from the CLI (0 = use config.yaml)
+./steamcache2 --max-concurrent-requests 8
+./steamcache2 --max-requests-per-client 4
 
 # Show help
 ./steamcache2 --help
@@ -311,7 +312,7 @@ This will direct any requests to `lancache.steamcontent.com` to your SteamCache2
 
 ### Prerequisites
 
-- Go 1.19 or later
+- Go 1.27.0 or later
 - Make (optional, but recommended)
 
 ### Build Commands
@@ -319,7 +320,7 @@ This will direct any requests to `lancache.steamcontent.com` to your SteamCache2
 ```bash
 # Clone the repository
 git clone <repository-url>
-cd SteamCache2
+cd steamcache2
 
 # Download dependencies
 make deps