chore: initialize project scaffold

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

.env.example

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+# ============================================================
+# AI Chat Exporter — Configuration
+# ============================================================
+# Copy this file to .env and fill in your values.
+# NEVER commit .env to git. It contains secrets.
+
+# --- ChatGPT ---
+# How to get: open chatgpt.com in Chrome → F12 → Application tab
+# → Cookies → https://chatgpt.com → find "__Secure-next-auth.session-token" → copy Value
+# Token type: JWT (starts with "eyJ"). Typically valid for ~7 days.
+CHATGPT_SESSION_TOKEN=
+
+# --- Claude ---
+# How to get: open claude.ai in Chrome → F12 → Application tab
+# → Cookies → https://claude.ai → find "sessionKey" → copy Value
+# Token type: opaque string. Typically valid for ~30 days.
+CLAUDE_SESSION_KEY=
+
+# --- Output ---
+# Where exported Markdown files are written (default: ./exports)
+EXPORT_DIR=./exports
+
+# Output folder structure. Options:
+#   provider/project/year  (default) → exports/claude/my-project/2024/file.md
+#   provider/project       → exports/claude/my-project/file.md
+#   provider/year          → exports/claude/2024/file.md (ignores projects)
+OUTPUT_STRUCTURE=provider/project/year
+
+# --- Cache ---
+# Where the sync manifest and logs are stored (default: ~/.ai-chat-exporter)
+CACHE_DIR=~/.ai-chat-exporter
+
+# --- Logging ---
+# Log file path. Set to "none" to disable file logging.
+LOG_FILE=~/.ai-chat-exporter/logs/exporter.log