Reject URLs with empty host, consolidate validation

[JulienTant]

Summary

Follow-up to #18 — closes a validation gap and cleans up the implementation.

• Correctness: https:// and http:///path were accepted because url.Parse returns a non-empty Scheme with empty Host. Adds a parsed.Host == "" guard so bare schemes are rejected.
• Cleanup: dropped the redundant url.ParseRequestURI pre-check (the Parse + scheme + host test covers every case in the existing table), and extracted a single validateHTTPURL helper used for both the blog URL and the feed URL.

Test plan

• New unit cases in TestAddBlogInvalidURL: https://, http:///path, feed https://.
• New e2e test TestAddBlogInvalidURL exercises the add command end-to-end in both flags and env modes with four invalid inputs, asserting Invalid URL on stderr.
• golangci-lint run ./... — clean.
• gotestsum ./... — 106 tests pass.

🤖 Generated with Claude Code

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 0653995f-b411-4c59-8ca4-627c56f96cce

📥 Commits

Reviewing files that changed from the base of the PR and between 24759df and 282f0ec.

📒 Files selected for processing (3)

• e2e/e2e_test.go
• internal/controller/controller.go
• internal/controller/controller_test.go

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch fix/url-host-validation

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