feat: remove README and cursor rules, update dependencies, and implement authentication middleware

CLAUDE.md

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+# CLAUDE.md
+Behavioral guidelines to reduce common LLM coding mistakes. Merge with project-specific instructions as needed.
+Tradeoff: These guidelines bias toward caution over speed. For trivial tasks, use judgment.
+1. Think Before Coding
+Don't assume. Don't hide confusion. Surface tradeoffs.
+Before implementing:
+
+* State your assumptions explicitly. If uncertain, ask.
+* If multiple interpretations exist, present them - don't pick silently.
+* If a simpler approach exists, say so. Push back when warranted.
+* If something is unclear, stop. Name what's confusing. Ask.
+2. Simplicity First
+Minimum code that solves the problem. Nothing speculative.
+
+* No features beyond what was asked.
+* No abstractions for single-use code.
+* No "flexibility" or "configurability" that wasn't requested.
+* No error handling for impossible scenarios.
+* If you write 200 lines and it could be 50, rewrite it.
+Ask yourself: "Would a senior engineer say this is overcomplicated?" If yes, simplify.
+3. Surgical Changes
+Touch only what you must. Clean up only your own mess.
+When editing existing code:
+
+* Don't "improve" adjacent code, comments, or formatting.
+* Don't refactor things that aren't broken.
+* Match existing style, even if you'd do it differently.
+* If you notice unrelated dead code, mention it - don't delete it.
+When your changes create orphans:
+
+* Remove imports/variables/functions that YOUR changes made unused.
+* Don't remove pre-existing dead code unless asked.
+The test: Every changed line should trace directly to the user's request.
+4. Goal-Driven Execution
+Define success criteria. Loop until verified.
+Transform tasks into verifiable goals:
+
+* "Add validation" → "Write tests for invalid inputs, then make them pass"
+* "Fix the bug" → "Write a test that reproduces it, then make it pass"
+* "Refactor X" → "Ensure tests pass before and after"
+For multi-step tasks, state a brief plan:
+
+```
+1. [Step] → verify: [check]
+2. [Step] → verify: [check]
+3. [Step] → verify: [check]
+
+```
+
+Strong success criteria let you loop independently. Weak criteria ("make it work") require constant clarification.
+These guidelines are working if: fewer unnecessary changes in diffs, fewer rewrites due to overcomplication, and clarifying questions come before implementation rather than after mistakes.