feat: add --requestid flag to buzz add for idempotent datapoint creation

[Copilot]

Adds optional --requestid flag to buzz add command for safe retry of datapoint submissions. The requestid acts as an idempotency key scoped per goal: duplicate submissions are ignored, differing submissions with same requestid update the existing datapoint.

Changes

• beeminder.go: Add requestid parameter to CreateDatapoint(), use url.Values for proper form encoding (fixes potential issue with special characters in comment/value fields)
• main.go: Parse --requestid flag in handleAddCommand(), update help text
• messages.go: Pass empty requestid from TUI (feature not needed there)
• README.md: Document flag with usage examples
• beeminder_test.go: Add test coverage for requestid parameter handling

Usage

# Idempotent submission - safe to retry
buzz add reading 3 'chapter 5' --requestid=abc123
buzz add reading 3 'chapter 5' --requestid=abc123  # No duplicate created

# Update with same requestid
buzz add reading 4 'chapter 6' --requestid=abc123  # Updates existing datapoint

Maps to Beeminder API's requestid parameter per API docs.

Original prompt

Let's add a new argument to allow the user to specify a request id when using buzz add

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[github-actions]

🚀 Pre-release Build Ready

Test builds are ready! Install directly using the bin command:

# Install the pre-release
bin install https://github.com/PinePeakDigital/buzz/releases/tag/pr-193-latest buzz-pr-193

# Run the pre-release
buzz-pr-193

# Uninstall the pre-release
bin remove buzz-pr-193

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