[api] Fix payloads and routes that Zou rejects or ignores

[frankrousseau]

Problem

• newEdit, getProjectTaskTypes, createBudgetEntry and buildWorkingFilePath sent keys or methods Zou rejects or drops
• Several options were silently ignored by Zou: budget fields, reply author, per-person studio filter, nb_elements
• allOpenTasks took no filter and no pagination, allLastEvents cut after/before to the local day
• Finished downloads stayed in the in-flight set, leaking memory
• logIn accepted an answer without access token; timecodes could show frame fps or a fractional frame

Solution

• Send episode_id, sep and the BudgetEntrySchema fields, read task types from their GET route
• Drop the ignored options
• Expose the open tasks filters Kitsu uses with page and limit, send event dates to the second in UTC, expose the name filter
• Release a download once its body is read or cancelled
• Reject a tokenless login, clamp timecode frames
• Add a coverage script, patch dependency updates, document the sibling checkouts the scripts need