Flatten XML entities in opentopomap.xml for Mapnik compatibility

[Copilot]

Mapnik does not support DTD/ENTITY declarations. The main stylesheet referenced 73+ external files via XML entities, causing parsing failures.

Changes

• Removed DTD/ENTITY system: Eliminated DOCTYPE declaration and all entity definitions
• Inlined external content: Merged 73 style files from styles-otm/*.xml, include files (fontset-settings.xml.inc, postgis-settings.xml.inc), and entity definitions from inc/entities.xml.inc
• Preserved standard XML entities: Kept < and > for literal characters
• Updated .gitignore: Added *.bak pattern

Result

File expanded from 712 to 9,127 lines. All 80 styles, 62 layers, and 1,121 rules now inline. Validated with Python XML parser - all element counts match original.

Before:

<!DOCTYPE Map [
  <!ENTITY landuse SYSTEM "styles-otm/landuse.xml">
  <!ENTITY maxscale_zoom16 "<MaxScaleDenominator>12500</MaxScaleDenominator>">
  ...
]>
<Map>
  &landuse;
  <Rule>
    &maxscale_zoom16;
  </Rule>
</Map>

After:

<Map>
  <Style name="landuse">
    <!-- Direct content from styles-otm/landuse.xml -->
  </Style>
  <Rule>
    <MaxScaleDenominator>12500</MaxScaleDenominator>
  </Rule>
</Map>

Original prompt

Remove xml entities system from xml files. Flatten all of them on opentopomap.xml file. Mapnikt does not support DTD / ENTITY system.

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