ROBYN_BROWSER_OPEN=False paradoxically opens the browser

Bug Description

Robyn.start() reads the ROBYN_BROWSER_OPEN env var like this:

https://github.com/sparckles/Robyn/blob/main/robyn/__init__.py#L979

open_browser = bool(os.getenv("ROBYN_BROWSER_OPEN", self.config.open_browser))

os.getenv(...) always returns a str (or the fallback) when the variable is set, and in Python bool("False") is True — any non-empty string is truthy, regardless of its contents. So setting ROBYN_BROWSER_OPEN=False in a robyn.env file — exactly as shown in the project's own documentation example — does the opposite of what it says: it evaluates to True and opens the browser.

The docs (https://robyn.tech, "Configuring the server through an environment file") list this as a plain boolean toggle with Default: False, Example: ROBYN_BROWSER_OPEN=True, giving no indication that setting it to the string "False" won't disable it.

Steps to Reproduce

import os
os.environ["ROBYN_BROWSER_OPEN"] = "False"
print(bool(os.getenv("ROBYN_BROWSER_OPEN", False)))  # True

Any Robyn app started with ROBYN_BROWSER_OPEN=False in its robyn.env (or process environment) will open a browser tab on startup, which is presumably not what a user setting that value intended.

Expected vs Actual

• Expected: ROBYN_BROWSER_OPEN=False disables the browser auto-open, matching the documented boolean semantics.
• Actual: any non-empty string value — including the literal word "False" — is truthy and enables it.

Suggested Fix

Parse the string explicitly instead of relying on Python truthiness, e.g.:

open_browser = os.getenv("ROBYN_BROWSER_OPEN", str(self.config.open_browser)).strip().lower() in ("1", "true", "yes")

(matching the parsing style already used elsewhere for boolean-ish env vars, e.g. ROBYN_DEV_MODE in _handle_dev_mode).

Additional Info

Found via a broader codebase audit while working on #485 (response compression). Robyn version: main branch.