Auto-generated API doc: doxygen → custom Python emitter → doc/api/.

`cmake --build build --target doc` runs Doxygen to produce XML, then
`doc/gen_api_md.py` (~330 lines, stdlib-only) emits a Markdown tree
under `doc/api/` that gitea renders directly in its file browser.

- 24 class/struct pages + 51 source-file pages + indices, with source
  links of the form `../../../../src/...#L42` that gitea turns into
  clickable line-anchored links.
- Doxyfile.in templated by CMake (XML-only output to build/doc/xml/).
- Pure Python emitter, zero external deps — no doxybook2 (not packaged
  on Arch) and no moxygen (avoids Node).
- Target gracefully disabled if Doxygen or Python 3 is missing at
  configure time; regular build target unaffected.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

doc/api/classes/ImportOds.md

@@ -0,0 +1,33 @@
+# ImportOds
+
+`class ImportOds` — inherits [ImportBase](../classes/ImportBase.md)
+
+Defined in [import_ods.hpp:6](../../../../src/imports/import_ods.hpp#L6)
+
+## Private Attributes
+
+### `std::string filename_`
+
+📍 [import_ods.hpp:8](../../../../src/imports/import_ods.hpp#L8)
+
+## Public Functions
+
+### `ImportOds(std::string filename)`
+
+📍 [import_ods.hpp:11](../../../../src/imports/import_ods.hpp#L11)
+
+### `void parse(Signals *signals) override`
+
+📍 [import_ods.hpp:12](../../../../src/imports/import_ods.hpp#L12)
+
+Pure virtual method for parsing the file.
+
+Derived classes must implement this method to define how the file is parsed.
+
+**Parameters**
+
+- `signals` — Pointer to the signals object to be completed.
+
+---
+
+← [Back to classes](index.md) · [Top](../index.md)