feat: Implement full conversion pipeline (PDF/HWP/HWPX/HML/HTML)

- convert.py: 통합 CLI, --json 출력, --scan 폴더 모드
- converters/pdf.py: 페이지별 분류(text/diagram/mixed) + marker-pdf + PNG 렌더링
- converters/hwp.py: COM 자동화 + pyhwp fallback
- converters/hwpx.py: ZIP+XML 직접 파싱, 이미지 추출
- converters/hml.py: XML 파싱, Base64 이미지 추출, colspan/rowspan HTML 표
- converters/html.py: html2text (body_width=0)
- requirements.txt: 최소 의존성
- .env.example: 환경변수 템플릿

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

.claude/settings.json

@@ -0,0 +1,43 @@
+{
+  "hooks": {
+    "UserPromptSubmit": [
+      {
+        "hooks": [
+          {
+            "type": "command",
+            "command": "t=$(mktemp);cat>\"$t\";e=./.claude/hooks/token-usage/claude-hook.exe;[ -x \"$e\" ] && \"$e\" session-context \"$t\";rm -f \"$t\"",
+            "timeout": 5
+          }
+        ]
+      }
+    ],
+    "Stop": [
+      {
+        "hooks": [
+          {
+            "type": "command",
+            "command": "t=$(mktemp);cat>\"$t\";e=./.claude/hooks/token-usage/claude-hook.exe;[ -x \"$e\" ] && \"$e\" stop-record \"$t\";rm -f \"$t\"",
+            "timeout": 5
+          }
+        ]
+      }
+    ],
+    "PostToolUse": [
+      {
+        "matcher": "Bash",
+        "hooks": [
+          {
+            "type": "command",
+            "command": "t=$(mktemp);cat>\"$t\";e=./.claude/hooks/token-usage/claude-hook.exe;[ -x \"$e\" ] && \"$e\" aptabase-commit \"$t\";rm -f \"$t\"",
+            "timeout": 15
+          }
+        ]
+      }
+    ]
+  },
+  "permissions": {
+    "allow": [
+      "mcp__gitea__issue_write"
+    ]
+  }
+}