chore: add ROADMAP (#16)

ROADMAP.md

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+# Roadmap
+
+Below is the planned feature roadmap for this project.
+
+Each item includes a **priority level** (`P1` = High, `P2` = Medium, `P3` = Low).  
+Priorities and scope may change as feedback and development progress.
+
+---
+
+### Chore & Maintenance
+| Task                                  | Priority | Status |
+|---------------------------------------|----------|--------|
+| Evaluate ESLint vs OxLint integration | P2       | ☐ |
+| Improve frontend test coverage        | P1       | ☐ |
+| E2E tests                             | P3       | ☐ |
+
+---
+
+### Core Features
+| Feature                                      | Priority | Status |
+|----------------------------------------------|----------|--------|
+| Tab support                                  | P3       | ☐ |
+| File uploads                                 | P3       | ☐ |
+| History Viewer & Rewind                      | P2       | ☐ |
+| Auto-select route parameter segment on click | P2       | ☐ |
+| Internal shareable links                     | P3       | ☐ |