[BUG] `serve()` auto-detection fails silently if entry point function is not named `main`

### **Describe the bug**

The `serve()` function attempts to auto-detect the `appname` (module path) to enable `uvicorn` reloading. However, the detection logic in `api/00_core.ipynb` (exported to `fasthtml/common.py`) contains a hardcoded check that requires the calling function to be named exactly `"main"`.

If a user defines a console script entry point in `pyproject.toml` pointing to a function with a different name (e.g., `start()` or `run_app()`), the `appname` detection fails, returning `None`. Consequently, `uvicorn.run` is never called, and the program exits silently without error.

### **Minimal Reproducible Example**

**1. Python File (`myapp.py`)**

```python
from fasthtml.common import serve, FastHTML

app = FastHTML()

# This function name causes the failure
def start_app():
serve()

# If you rename this to 'def main():', it works.

```

**2. pyproject.toml**

```toml
[project.scripts]
# Entry point pointing to a non-main function
myserver = "myapp:start_app"

```

**3. Execution**
Run the console command:

```bash
$ myserver
# Result: Process exits immediately. Server does not start.

```

### **Expected behavior**

`serve()` should correctly detect the module name via `inspect` regardless of the specific name of the entry point function. The logic should rely on the stack frame context (`bk.f_back.f_globals.get('__name__') == '__main__'`) rather than `code.co_name == 'main'`.

### **Environment Information**

* fastlite version: 0.2.3
* fastcore version: 1.9.4
* fasthtml version: 0.12.36

### **Confirmation**

* [x] I have read the FAQ ([https://docs.fastht.ml/explains/faq.html](https://docs.fastht.ml/explains/faq.html))
* [x] I have provided a minimal reproducible example
* [x] I have included the versions of fastlite, fastcore, and fasthtml
* [x] I understand that this is a volunteer open source project with no commercial support.

### **Additional context**

The issue is located in the `serve` function logic.

**Current Logic (causes failure):**

```python
elif code.co_name=='main' and bk.f_back.f_globals.get('__name__')=='__main__':
appname = inspect.getmodule(bk).__name__

```

**Suggested Fix:**
Remove the `code.co_name=='main'` check. If the caller's globals indicate it was invoked by the `__main__` entry point wrapper, the function name is irrelevant.

```python
elif bk.f_back.f_globals.get('__name__')=='__main__':
appname = inspect.getmodule(bk).__name__

```