docs: add obikmer user guide and MkDocs build configuration

Introduces a comprehensive documentation set covering theoretical foundations, CLI usage, installation, and system architecture. Adds MkDocs configuration and Makefile targets to generate, serve with live reload, and clean the documentation site. Includes citation styles and bibliography files for academic references.

Makefile

@@ -10,6 +10,11 @@ DOC_FILE := mkdocs.yml
 DOC_SITE := doc
 DOC_PORT := 8001
 
+DOC_USER_DIR  := UserDocMD
+DOC_USER_FILE := mkdocs-user.yml
+DOC_USER_SITE := doc-user
+DOC_USER_PORT := 8002
+
 # ── virtualenv ────────────────────────────────────────────────────────────────
 
 $(VENV)/bin/activate:
@@ -60,8 +65,22 @@ doc-serve: $(MKDOCS)
 clean-doc:
 	rm -rf $(DOC_SITE)/
 
+.PHONY: doc-user
+doc-user: $(MKDOCS)
+	$(MKDOCS) build -f $(DOC_USER_FILE)
+
+.PHONY: doc-user-serve
+doc-user-serve: $(MKDOCS)
+	$(MKDOCS) serve -f $(DOC_USER_FILE) \
+	                --dev-addr=127.0.0.1:$(DOC_USER_PORT) \
+	                --livereload
+
+.PHONY: clean-doc-user
+clean-doc-user:
+	rm -rf $(DOC_USER_SITE)/
+
 .PHONY: clean
-clean: clean-doc
+clean: clean-doc clean-doc-user
 	rm -rf $(VENV)
 
 # ── release ───────────────────────────────────────────────────────────────────