feat: initial live.f12.rocks SFTP → gmic/rembg → web pipeline

Event pep stack with SFTPGo inbox, sequential worker, FastAPI gallery/remix, and Traefik-ready compose.

Co-authored-by: Cursor <cursoragent@cursor.com>

assets/blend_modes

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+add
+alpha
+and
+average
+blue
+burn
+darken
+difference
+divide
+dodge
+edges
+exclusion
+freeze
+grainextract
+grainmerge
+green
+hardlight
+hardmix
+hue
+interpolation
+lchlightness
+lighten
+lightness
+linearburn
+linearlight
+luminance
+multiply
+negation
+or
+overlay
+pinlight
+red
+reflect
+saturation
+screen
+seamless
+seamless_mixed
+shapeareamax
+shapeareamax0
+shapeareamin
+shapeareamin0
+shapeaverage
+shapeaverage0
+shapemedian
+shapemedian0
+shapemin
+shapemin0
+shapemax
+shapemax0
+shapeprevalent
+softburn
+softdodge
+softlight
+stamp
+subtract
+value
+vividlight
+xor