docs: remove pip install references, replace with uv (#24)

Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: deviantintegral <255023+deviantintegral@users.noreply.github.com>

Author: Copilot

README.md

@@ -10,21 +10,13 @@ Async Python library for controlling Dimplex, Faber, and Real Flame fireplaces v
 
 ## Installation
 
-```bash
-pip install flameconnect
-```
-
-Or with [uv](https://docs.astral.sh/uv/):
-
 ```bash
 uv add flameconnect
 ```
 
 To include the interactive terminal dashboard (TUI):
 
 ```bash
-pip install flameconnect[tui]
-# or
 uv add flameconnect[tui]
 ```
 
@@ -156,7 +148,7 @@ flameconnect tui
 [Textual](https://textual.textualize.io/). It requires the TUI extra:
 
 ```bash
-pip install flameconnect[tui]
+uv add flameconnect[tui]
 ```
 
 The dashboard displays real-time fireplace status and auto-refreshes every 10

src/flameconnect/cli.py

@@ -816,8 +816,7 @@ async def cmd_tui(*, verbose: bool = False) -> None:
         from flameconnect.tui import run_tui
     except ImportError:
         print("The TUI requires the 'tui' extra. Install with:")
-        print("  pip install flameconnect[tui]")
-        print("  # or: uv add flameconnect[tui]")
+        print("  uv add flameconnect[tui]")
         sys.exit(1)
     await run_tui(verbose=verbose)