Fix all lint/build issues on main branch (closes #13)
- Resolve duplicate method declarations (CreateUser, GetUserByToken,
GetUserByNick) between db.go and queries.go by renaming queries.go
methods to CreateSimpleUser, LookupUserByToken, LookupUserByNick
- Fix 377 lint issues across all categories:
- nlreturn (107): Add blank lines before returns
- wsl_v5 (156): Add required whitespace
- noinlineerr (25): Use plain assignments instead of inline error handling
- errcheck (15): Check all error return values
- mnd (10): Extract magic numbers to named constants
- err113 (7): Use wrapped static errors instead of dynamic errors
- gosec (7): Fix SSRF, SQL injection warnings; add nolint for false positives
- modernize (7): Replace interface{} with any
- cyclop (2): Reduce cyclomatic complexity via command map dispatch
- gocognit (1): Break down complex handler into sub-handlers
- funlen (3): Extract long functions into smaller helpers
- funcorder (4): Reorder methods (exported before unexported)
- forcetypeassert (2): Add safe type assertions with ok checks
- ireturn (2): Replace interface-returning methods with concrete lookups
- noctx (3): Use NewRequestWithContext and ExecContext
- tagliatelle (5): Fix JSON tag casing to camelCase
- revive (4): Rename package from 'api' to 'chatapi'
- rowserrcheck (8): Add rows.Err() checks after iteration
- lll (2): Shorten long lines
- perfsprint (5): Use strconv and string concatenation
- nestif (2): Extract nested conditionals into helper methods
- wastedassign (1): Remove wasted assignments
- gosmopolitan (1): Add nolint for intentional Local() time display
- usestdlibvars (1): Use http.MethodGet
- godoclint (2): Remove duplicate package comments
- Fix broken migration 003_users.sql that conflicted with 002_schema.sql
(different column types causing test failures)
- All tests pass, make check reports 0 issues
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